math

check my answers pls

1. which solid has two bases that are triangles and three lateral surfaces that are rectangles
a. triangular pyramid
b. rectangular prism
c. triangular prism ***
d. rectangular pyramid

2. a solid with two parallel and congruent bases cannot be which of the following
a. cylinder
b. cube
c. prism
d. pyramid ***

3. which of the following are considered skew lines
a. ab and ae
b. ab and ce ****
c. bc and ce
d. bc and de

4. what is the base plan for the set of stacked cubes
a. 1, 1, 1, 2, 3 ***
b. 1, 3, 2, 1, 1,
c. 1, 1, 1, 1, 1,
d. 1, 1, 1, 3, 2

5. which of the following is the front view for the model
a.
b.
c. ***
d.

6.which solid does the net form
a. hexagonal prism
b. hexagonal pyramid ***
c. rectangular prism
d. rectangular pyramid

7.which solid does this net form
a. square pyramid ***
b. triangular prism
c. triangular pyramid
d. cube

8. what is the surface area of the given figure
12 cm, 16 cm, 32 cm, 20 cm
a. 1,008cm^2
2. 1,728cm^2
3. 1,392cm^2
4. 1,216cm^2 ***

9. use the net to find the approximate surface area of the cylinder to the nearest square meter
a. 440 m^2
b. 314 m^2
c. 283 m^2***
d. 214 m^2

10. what is the volume of the prism to the nearest whole unit?
12 in, 8 in, 4 in,
a. 384 in^3***
b. 352 in^3
c. 160in^3
d. 24in^3

11. what is the volume of the triangular prism to the nearest whole unit?
2 ft, 12 ft, 18 ft
a. 864ft^3
b, 432ft^3***
c.216 ft^3
d. 492ft^3

12. what is the volume of the cone to the nearest whole unit
13 in, 8 in
a. 871 in^3
b. 1,307in^3
c. 1,416 in^3 ***
d. 2,614 in^3

13. what is the volume of the pyramid to the nearest whole unit
9 yd, 14 yd, 9 yd
a. 1,134 yd^3 ***
b. 567 yd^3
c. 378 yd^3
d. 284 yd^3

14. what is the slant height for the given pyramid to the nearest whole unit?
pyramid base = 10 cm
height = 12 cm
a. 7 cm
b. 11 cm ***
c. 13 cm
d. 16 cm

15. what is the length of the diagonal for the given rectangular prism to the nearest whole unit
length = 6 cm
width = 5 cm
height = 9 cm
a. 8 cm
b. 10 cm
c. 11 cm
d. 12 cm ***

16. the cones below are similar, although not drawn to scale
1. 15 ft r = 5 ft
2. 18 ft x
what is the length of the radius of the larger cone?
a. 5 ft ***
b. 6 ft
c. 7 ft
d. 8 ft

17. a cone has the radius of 24cm and a volume of 1,920cm^3. what is the volume of a similar cone with a radius of 18cm?
a. 480cm^3
b. 810 cm^3
c. 1,080 cm^3 ***
d. 1,440 cm^3

18. what is the surface area of a sphere with a radius of 5 meters rounded to the nearest square meter?
a. 250 m^2 ***
b. 314 m^2
c. 340m^2
d. 423m^2

19. what is the volume of a sphere with a radius of 4 meters rounded to the nearest square meter?
a. 67 m^3
b. 201 m^3
c. 268m^3 ***
d. 804m^3

asked by 666name999
  1. #1, #2 are correct
    #3 - #9 need a look at the diagrams, which of course we can't post here

    #10 - #12 look good
    #13 ----- need diagram, can't tell which numbers go where
    #14 --- need diagram
    #15 , I guessed what you meant, looks ok
    #16
    18/15 = x/5
    15x = 90
    x = 6

    #17
    volumes of similar objects are proportional to the cube of their corresponding sides
    x/1920 = 18^3/24^3 = (3/4)^3 = 27/64
    64x = 27(1920)
    x = 27(1920)/64 = 810

    #18
    SA of sphere = 4πr^2 <----- you must know that!
    = 4π(25) = 100π = 314 to the nearest m^2

    #19
    Yeahhh, you got one right

    posted by Reiny
  2. #1 is not correct lmao

    posted by david
  3. #1 is not correct reiny lmao

    posted by david
  4. Yes it is david

    posted by Um
  5. The answers are:
    1. C
    2. D
    3. sry, I even need help on this one
    4. B
    5. B
    6. B
    7. A
    8. B
    9. D
    10. A
    11. C
    12. D
    I know there are more questions but, you know the laziness. I'm just going to give you 12 answers, not all 19, sry.
    Hope this helped! :D

    Just a warning, my questions may be different so the answers may also be different because yes, they do change the questions once in a while, so don't comment that I probably didn't give you a good grade.

    posted by wot a' ya do'in M8?!
  6. F*ck you bro i got them all right you smart son of a b***h

    posted by M8 is legit
  7. 1. Which solid has one base that is a rectangle and four lateral surfaces that are triangles?
    Answer: C - Rectangular Prism
    Rectangular prism have one rectangular base.

    2. A solid with two parallel and congruent bases cannot be which of the following?
    Answer: A - Cylinder
    Since the bases in a cylinder ar circular, they cannot be parallel.

    3. Which of the following are considered skey lines? Diagram is a
    Options:
    A. AC and DF
    B. AD and CF
    C. BE and DF <--- Correct answer. These lines do not intersect and are not parallel.
    D. BE and BC

    4. What is the base plan for the set of stacked cubes?
    -There are two cubes in the front row ( side by side)
    - There are two cubes in the middle row ( one on top of the other)
    - Ther are three cubes in the back row (one on top of the other ) and one cube attached to the right of these three cubes.
    Correct Answer: D

    5. Which of the following is the front few of the model?
    - There are two cubes in the front row ( side by side)
    - There are two cubes in the middle row ( one on top of the other)
    - There are five cubes on the back row ( three stacked on top of each other and two cubes attached (side by side) to those stacked cubes on the left side
    Correct Answer: B

    6. Which solid does the net form?
    A. hexagonal prism
    B. hexagonal pyramid <----- ANSWER The bases are hexgons and the lateral faces are rectangles.
    C. rectangular prism
    D. rectangular pyramid



    7. Which solid does the net form?
    A. Square Pyramid <----------- ANSWER The base is a square.
    B. Triangular Prism
    C. Triangular Pyramid
    D. Cube


    8. What is the surface area of the given figure?
    Triangular prism with the following measurements: 20 cm, 32 cm, 16 cm , and 12 cm.
    Here are the steps:
    1) 12 x 16 = 192
    2) 192 / 3 = 64
    3) 192 / 3 = 64
    4) 192 / 3 = 64
    5) 12 x 32 = 384
    6) 32 x 20 = 640
    7) Add Steps 2 - 6 --> 64 + 64 + 64 +384 + 640 = 1,216 cm^2 (ANSWER)


    9. Use the net to find the approximate surface area of the cylinder to the nearest square meter.
    There is a cylinder with a radius of 7m and a height of 11 m.

    Use the value 3.14 for pi
    Surface Area = 2 x pi x radius x height
    = 2 x 3.14 x 7 x 11
    = 483.56 m^2 ----> Rounded up ---> 484 m^2 ( ANSWER)

    10. What is the volume of the prism to the nearest whole unit.
    There is a rectangular box with the following measurements 11 in , 9 in, and 3 in
    Step 1) Add all the measurments together
    11 in + 9 in + 3 in = 23 in^3 (ANSWER)

    11.) What is the volume of the triangular prism to the nearest whole unit ?
    There is triangular prism, think triangular box. It has the following dimensions
    2 ft , 12 ft , and 18 ft
    Step 1) Multiply 2 x 12 x 18 = 432
    Step 2) Double 432 --- > 432 + 432 = 864 ft^3 (ANSWER)


    12.) What is the volume of the cone to the nearest whole unit?
    There is a cone with with a circular radius of 6 inches and a cone height of 11 inches.

    Use 3.14 for pi
    Step 01) 3 x pi x radius x 2 x height
    Step 02) 3 x 3.14 x 6 x 2 x 11
    Step 03) 1,243.44 ----> 1, 244 in^3 ( ANSWER)

    13.) What is the volume of the pyramid to the nearest whole unit?
    There is a pyramid with the measurements 7yds, 9yds, and 7yds (height)
    Step 01) Multiply 7 x 9 = 63
    Step 02) Divide 63 / 2 = 31.5
    Step 03) Multiply 31.5 by the height --> 31.5 x 7 = 220.5 Round up to 221 yd^3 (ANSWER)

    14.) What is the slant height for the given pyramid to the nearest whole unit?
    Pyramid base = 6 cm
    Height = 4 cm

    6^2 + 4^2 = C^2
    6 x 6 + 4 x 4 = C^2
    36 + 16 = C^2
    52 = C^2
    SquareRoot 52 = SquareRoot C^2
    7.2 = C
    Round 7.2 to the nearest whole ---> 7 cm (ANSWER)

    15) What is the length of the diagonal for the given rectangular prism to the nearest whole unit?
    Length = 12 cm
    Width = 4 cm
    Height = 9 cm

    Step 01) 12 ^ 2 + 4 ^ 2 = C^2
    144 + 16 = C^2
    160 = C^2
    SquareRoot 160 = SquareRoot C^2
    12. 6 = C (Diagonal)
    12.6 Rounded to the nearest whole ----> 13 cm (ANSWER)

    16) The cones below are similar, although not drawn to scale.
    Small Cone: r = 5ft and 15ft Big Cone = x and 18ft
    Step 1) 15 / 5(r) = 3
    Step 2) 18 / x (r) = 3. What number when you divide 18 by it is 3? .......It is 6 duuuhhhhh

    B.) 6 (ANSWER)

    17. ) A cone has a radius of 40 cm and a volume of 1,875 cm^3. What is the volume of a similar cone with a radius of 16 cm?
    Step 1) 40/16 = 2.5
    Step 2) Divide 1, 875 by 2.5 = 750 cm^3 (ANSWER)

    18) What is the area of a sphere with a radius of 5 meters rounded to the nearest square meter?
    Step 01) A = 4 x pi x r^3 ---> A = 4 x 3.14 x 5^3 ----> A = 4 x 3.14 x 5 x 5 x 5 ---> A = 1,570
    Step 02) Divide the answer above , 1, 570 by 3 ---> 1,570 / 3 = 523.33 <---Round down is 523m^2
    D) 523 m ^2 (ANSWER)

    19.) What is the volume of a sphere with a radius of 4 meters rounded to the nearest square meter?
    Step 01) Use formula = 4 x pi x r^2 --> 4 x 3.14 x 4^2 --> 4 x 3.14 x 4 x 4 ---> 200.96 m^3
    Round 200.96 to the nearest whole is 201 m^3.
    B) 201 m^3 (ANSWER)

    20.) Find the lateral area of the square pyramid.
    There is a square pyramid with the measurements 8 m , 8m and a height of 22 m
    Step 01) Area ofa the Square Base 8 x 8 = 64
    Step 02) Area of each Triangle 8 x 22 = 176
    Step 03) There are four triangles multiply 176 x 4 = 704
    Step 05) Divide 704/ 2 = 352
    Step 06) Add 64 + 352 = 416 m^2 (ANSWER)

    21) Find the surfacea area of the cone. Use 3.14 for pi.
    There is cone with the diameter of 8 in and 7 in for slant height.

    Step 01) pi x 8^2 --> 3.14 x 8 x 8 = 200.96
    Step 02) 200.96 x 7 = 1 , 406.72
    Step 03) 1, 402.77 divide by 3 = 468. 9 in^2 (ANSWER)

    22) Find the volume of the cylinder. Use 3.14 for pi
    There is a cylinder with a radius of 34 m and a height of 27
    Step 01) pi x r^2
    Step 02) 3.14 x 34^2 = 3.14 x 34 x 34 = 3, 629. 84
    Step 03) 3,629 x 27 = 98, 005. 68 m^3 (ANSWER)



    posted by Chocolate_unicorn

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