Surface Area of Cylinders Quick Check

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Question
Find the surface area of a cylinder with a radius of 5 inches and a height of 10 inches. Use the approximation 3.14 for pi.(1 point)
Responses

471 square inches
471 square inches

345.4 square inches
345.4 square inches

471 inches
471 inches

314 square inches
314 square inches
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1 answer

To find the surface area of a cylinder, we can use the formula:

\[ \text{Surface Area} = 2\pi r^2 + 2\pi rh \]

where \( r \) is the radius and \( h \) is the height.

Given:

  • \( r = 5 \) inches
  • \( h = 10 \) inches
  • Using \( \pi \approx 3.14 \)

Let's calculate it step by step.

  1. Calculate the area of the two bases: \[ 2\pi r^2 = 2 \times 3.14 \times (5)^2 = 2 \times 3.14 \times 25 = 157 \text{ square inches} \]

  2. Calculate the lateral surface area: \[ 2\pi rh = 2 \times 3.14 \times 5 \times 10 = 2 \times 3.14 \times 50 = 314 \text{ square inches} \]

  3. Add both areas together: \[ \text{Surface Area} = 157 + 314 = 471 \text{ square inches} \]

Thus, the surface area of the cylinder is 471 square inches.

Correct response: 471 square inches.

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