A right cylinder has a radius of 5 and a height of 9. What is its surface area?A.70 units2B.90 units2C.140 units2D.45 units2SUBMITarrow_backPREVIOUS
Question
A right cylinder has a radius of 5 and a height of 9. What is its surface area?
A. 70 units²
B. 90 units²
C. 140 units²
D. 45 units²
SUBMIT
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Solution
The surface area of a right cylinder is given by the formula: 2πrh + 2πr².
Here, r is the radius and h is the height of the cylinder.
Given that r = 5 units and h = 9 units, we can substitute these values into the formula:
Surface area = 2π(5)(9) + 2π(5)² = 90π + 50π = 140π units²
Therefore, the surface area of the cylinder is 140π units².
So, the closest answer is C. 140 units². Please note that the exact answer is 140π units², which is approximately 440 units².
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