Math
posted by Adrian
A rectangular prism has a length of 100 cm, a height of 10 cm and a width of 5 cm.
What is the volume of the rectangular prism?
A. 3100 square centimeters
B. 1550 square centimeters
C. 5000 square centimeters
D. 1200 square centimeters
2. A cylinder has a diameter of 5 meters and a height of 10 meters.
What is the volume of the cylinder?
A. 188.4 meters cubed
B. 117.75 meters cubed
C. 176.625 meters cubed
D. 196.25 meters cubed
3. A cylinder has a radius of 10 meters and a height of 100 meters.
What is the volume of the cylinder?
A. 65,904 meters cubed
B. 69,008 meters cubed
C. 37,680 meters cubed
D. 31,400 meters cubed

Ms. Sue
I'll be glad to check your answers.
These sites will help you.
http://math.about.com/od/formulas/ss/surfaceareavol_4.htm
http://www.mathopenref.com/cylindervolume.html 
Adrian
C
B
D? 
Ms. Sue
1 and 3 are correct.
2 is wrong. Did you use the radius in this problem? 
Adrian
no

Ms. Sue
What is your answer using the radius?

Adrian
im not sure how to solve this problem at all

Ms. Sue
Solve it the same way you solved # 3.
V = pi * r^2 * h
See the website above for more explanation. 
Adrian
divide the left and right side of the equation by ð r^2
V / (ð r ^2) = h ? 
Ms. Sue
You need to find the volume of the cylinder. Use the volume formula above.
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