# pre-algebra NEED HELP!

1.Which solid has one base that is a triangle and three lateral surfaces that are triangles?

A:triangular pyramid***
B:triangular prism
C:rectangular prism
D:rectangular pyramid

2:Sara needs to cover the top and the sides of the cylinder below.

8in 12in
About how many squat inches of paper will Sara need?

A:352in²***
B:402in²
C:804in²
D:1,005in²

3.what is the surface area of a sphere with a radius of 4 meter rounded to the nearest square meter?

A:50m²
B:101m²
C:201m²
D:268m²***

4.What is the volume of asphere with a radius of 5 meters rounded to the nearest square meter?

A:560m³
B:314m³
C:340m³
D:524m³***

5.What is the volume of a sphere with a radius of 7 cm rounded to the nearest cubic centimeter?

A:4,310cm³
B:1,437cm³***
C:615cm³
D:359cm³

Correct me if I'm wrong

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posted by GummyBears
2. #1, 4,5 are correct
#3
SA of a sphere = 4π r^2
so if r = 4
SA = 4π(16) = appr 201

#2, can't see the diagram, will assume r = 8, height = 12 , cover the top but not the bottom
SA = πr^2 + 2πrh
= π(64) + 2π(8)(12) = appr 804

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posted by Reiny

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