Math for Ms. Sue please!
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

I don't know about 17, but the others are right.
posted by Ms. Sue

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

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

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.posted by Dr. Jane

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.
posted by drwls

I am confused! Is 17 240 or 160??
posted by Delilah

It's as drwls said  160 cm^3
posted by Ms. Sue

Rectangular prism
posted by Anonymous

are the answers right
posted by Andy Grammer

Question 17 is right number 2 not sure.
posted by Andy Grammer

Love Jiskha
posted by Andy Grammer

no ones right
posted by bear

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