Volume and Surface Area of Cylinders (4)

Volume and Surface Area of Cylinders

Volume =  $\pi$  x  $radius^2$  x height

V =  $\pi r^2h$  

Multiple Choice

 $V=\pi r^2h$  

What is V when r = 3 and h = 10?

Remember  $\pi=3.14$  

• 282.6

• 94.2

• 90

How did I do that?

•  $V=\pi r^2h$  

•  $V=\left(3.14\right)\left(3^2\right)\left(10\right)$   

• V = 282.6

Multiple Choice

 $V=\pi r^2h$  

What is V when r = 5 and h = 8?

Remember  $\pi=3.14$  

• 1004.8

• 628

• 125.6

How did I do that?

•  $V=\pi r^2h$  

•  $V=\left(3.14\right)\left(5^2\right)\left(8\right)$   

• V = 628

Surface Area = 2 x  $\pi$  x  $radius^2\$ + 2 x  $\pi$  x radius x height 

SA =  $2\pi r^2\ +\ 2\pi rh$  

Multiple Choice

 $SA\ =2\pi r^2\ +\ 2\pi rh$ 
What is SA when r = 3 and h = 10.
Remember  $\pi\ =\ 3.14$   

• 244.92

• 56.52

• 188.4

• 207.24

How did I do that?

•  $SA\ =\ 2\pi r^2\ +\ 2\pi rh$  

• SA = (2)(3.14)( $3^2$ ) + (2)(3.14)(3)(10)

• SA = 56.52 + 188.4

• SA = 244.92

Multiple Choice

 $SA\ =2\pi r^2\ +\ 2\pi rh$ 
What is SA when r = 5 and h = 8.
Remember  $\pi\ =\ 3.14$   

• 157

• 25.12

• 408.2

• 282.6

How did I do that?

•  $SA\ =\ 2\pi r^2\ +\ 2\pi rh$  

• SA = (2)(3.14)( $5^2$ ) + (2)(3.14)(5)(18)

• SA = 157 + 251.2

• SA = 408.2