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

Math for Ms. Sue please! 
Ms. Sue
I don't know about 17, but the others are right.

Math for Ms. Sue please! 
Delilah
I am not sure about 17 either. Do you know how to solve it?

Math for Ms. Sue please! 
Ms. Sue
I'm not sure. Please post 17 as a separate question, without my name.

Math for Ms. Sue please! 
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. 
Math (cone volume) 
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.

Math for Ms. Sue please! 
Delilah
I am confused! Is 17 240 or 160??

Math for Ms. Sue please! 
Ms. Sue
It's as drwls said  160 cm^3

Math for Ms. Sue please! 
Anonymous
Rectangular prism

Math for Ms. Sue please! 
Andy Grammer
are the answers right

Math for Ms. Sue please! 
Andy Grammer
Question 17 is right number 2 not sure.

Math for Ms. Sue please! 
Andy Grammer
Love Jiskha

Math for Ms. Sue please! 
bear
no ones right
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