Math for Ms. Sue please!

posted by Delilah

1.
Name the solid with the description as a figure that has one base that is a rectangle and four lateral surfaces that are triangles. (1 point)

triangular pyramid
cone
rectangular prism
rectangular pyramid

2.
A solid with two parallel and congruent bases cannot be which of the following? (1 point)

cone
prism
cylinder
cube

17.
A cone has a radius of 15 cm and a volume of 540 cm3. Find the volume of a similar cone with a radius of 10 cm. (1 point)

54 cm3
240 cm3
160 cm3
360 cm3

18.
Find the surface area of a sphere with a radius of 5 meters. (1 point)

about 250 m2
about 314 m2
about 340 m2
about 523 m2

19.
Find the volume of a sphere with a radius of 5 meters. (1 point)

about 560 m3
about 314 m3
about 340 m3
about 523 m3

My answers:
1. rectangular pyramid
2. cone
17. 240 cm
18. about 314
19. about 523

  1. Ms. Sue

    I don't know about 17, but the others are right.

  2. Delilah

    I am not sure about 17 either. Do you know how to solve it?

  3. Ms. Sue

    I'm not sure. Please post 17 as a separate question, without my name.

  4. Dr. Jane

    I think 17 is correct.

    If I remember the formula correctly it is
    V = 1/3 times r^2 times h

    What is given allows us to find h.
    Then you can use 10 cm and the h to find the new volume.

  5. drwls

    17. A "similar" cone would have the height and radius reduced by the same fraction (2/3 in this case). The volume would be reduced by a factor (2/3)^3 = 8/27. Multiply that by 540 and you get 160 cm^3.

  6. Delilah

    I am confused! Is 17 240 or 160??

  7. Ms. Sue

    It's as drwls said -- 160 cm^3

  8. Anonymous

    Rectangular prism

  9. Andy Grammer

    are the answers right

  10. Andy Grammer

    Question 17 is right number 2 not sure.

  11. Andy Grammer

    Love Jiskha

  12. bear

    no ones right

  13. Anonymous

    Even though I like 999 years late it would be 160 for the answer

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