Question

Use the net to find the approximate surface area of the cylinder to the nearest square meter.

Radius=5
Height=9

Answer 1

S.A. = 440 m²

Explanation:

Look at the picture.

We have the rectangle 2πr × h and two circles.

Therefore the formula of a Surface Area is:

`S.A.=2\pi rh+2\pi r^2`

We have r = 5m and h = 9m. Substitute:

`S.A.=2\pi(5)(9)+2\pi(5^2)=90\pi+50\pi=140\pi\ m^2`

`\pi\approx3.14\to S.A.\approx(140)(3.14)\approx440\ m^2`