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Find the surface area of a cylinder with a base radius of 4 yd and a height of 9 yd.

User Mkk
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Answer:

The surface area of the cylinder is 326.56yd²

Explanation:

To solve this problem we have to calculate the circle area and the lateral area

To calculate the area of ​​the circle we use the following formula

a = area

r = radius = 4yd

π = 3.14

a = π * r²

we replace with the known values

a = π * (4yd)²

a = π * 16yd²

a = 50.24yd²

The area of the circle is 50.24yd²

To calculate the lateral area of ​​the cylinder we use the following formula

a = area

h = heighti = 9yd

r = radius = 4yd

π = 3.14

a = 2 * π * r * h

we replace with the known values

a = 2 * 3.14 * 4yd * 9yd

a = 6.28 * 36yd²

a = 226.08yd²

The lateral area of ​​the cylinder is 226.08yd²

Now we add the lateral area of ​​the cylinder with 2 times the area of ​​the circle and obtain the area of ​​the cylinder

226.08yd² + (2 * 50.24yd² ) = 326.56yd²

The surface area of the cylinder is 326.56yd²

User Monksp
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