Surface Area and Volume of Cylinders homework?

A= 2 π(r)h+4π(r²)

V=π(r²)h

1)11.5(height) by 6(width)

h= 11.5

r= 6/2 = 3

A= 2 π(3)(11.5)+4π(3)²

A=69π+36π

A=105π

A≈ 329.87

V=π3²(11.5)

V=103.5π

V≈ 325.15

Answer: A=105π, V=103.5π

2.) h=5.5 w=3

r=3/2= 1.5

A= 2 π(1.5)(5.5)+4π(1.5)²

A=16.5π+9π

A=25.5π

A≈ 80.11

V=π(1.5)²(5.5)

V=12.375π

V≈ 38.88

Answer: A=25.5π, V=12.375π

3)h=110 w=60

r=60/2 = 30

A= 2 π(30)(60)+4π(30)²

A=3600π+3600π

A=7200π

A≈ 22,619.47

V=π(30)²(110)

V=99,000π

V≈ 311,017.67

Answer: A=7200π, V=99,000π

Hope that was helpful! Best Answer?

Surface area includes the two bases and the side of the cylinder. SA = 2(pi)r^2 + 2(pi)rh your radius is (1/2)65 = 65/2mm and your h = 70mm Volume will be cubic so (pi)r^2 times h = volume.

Here are your Volume answers: Volume = pi x r2 x height

1. pi = 3.14159 r=3

3.14159 x 9 x 11.5 = 325.154565

2. 3.14159 x 2.25 x 5.5 = 38.87717625

3. 3.14159 x 900 x 110 = 311,017.41

i take it you mean diameter when you say WIDTH ?

also you need to know that it is a right circular cylinder - if so then see earlier answers, where d is diameter.

for surface area you need also to know whether the cylinder is CLOSED i.e. it has a lid and base or OPEN i.e. no lid or base

Sa = pi * d * height

Vol = pi d^2 /4 * height

you do the math

you need to know the radius of the base to find the answers!