Find the surface area of a cylinder with radius of 5 inches and a height of 10 inches. use the approximation 3.14 for pi

1 answer

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

\[ \text{Surface Area} = 2\pi r(h + r) \]

where:

  • \( r \) is the radius,
  • \( h \) is the height,
  • \( \pi \) is the mathematical constant (approximately 3.14 for this problem).

Given:

  • Radius (\( r \)) = 5 inches
  • Height (\( h \)) = 10 inches

Substituting the values into the formula:

\[ \text{Surface Area} = 2 \cdot 3.14 \cdot 5(10 + 5) \]

First, calculate \( 10 + 5 \):

\[ 10 + 5 = 15 \]

Now substitute this back into the equation:

\[ \text{Surface Area} = 2 \cdot 3.14 \cdot 5 \cdot 15 \]

Calculate \( 2 \cdot 3.14 \):

\[ 2 \cdot 3.14 = 6.28 \]

Now multiply \( 6.28 \cdot 5 \):

\[ 6.28 \cdot 5 = 31.4 \]

Finally, multiply \( 31.4 \cdot 15 \):

\[ 31.4 \cdot 15 = 471 \]

Thus, the surface area of the cylinder is:

\[ \text{Surface Area} \approx 471 \text{ square inches} \]