Can someone explain these 2 equations to me
V = πr²h
A = 2πr² + 2πrh

I dont get it!

Question

Can someone explain these 2 equations to me
 V = πr²h 
A = 2πr² + 2πrh 

I dont get it!

anonymous · Answer

V= pi x radius x radius x height.
A= 2 x pi x radius x radius + 2 x pi x radius x height

anonymous · Answer

those are the formulas for a cylinder

bahrom7893 · Answer

Volume of a cylinder
Surface Area of a cylinder

lgbasallote · Answer

they are volumes and total surface area of a cyclinder...the area of a cyclinder is equal to the lateral surface area (2 pi rh) +  the area of the two bases (2pi r^2 h) and the volume of a cylinder is equal to area of the base x height

anonymous · Answer

i know what each variable mean...but ... when i look at the cylinder, i dont get why use 2pi r^2 insteead of 2pi r < for circumference

hoblos · Answer

volume of cylinder is the area of the base of the cylinder multiplied by the height if the cylinder 
so   V = (πr²)h 

the surface area of a cylinder is the area of the area of top+area of bottom + area of rectangle you get by flattening the cylinder 
 A = πr²+πr² + 2πrh

anonymous · Answer

I get it now! thanks hoblos!

hoblos · Answer

good XD glad to help