A wheel of cheese has a diameter of 6 inches and a height of 2 inch. A chef is making an appetizer where the cheese will be covered with pastry. To know how much pastry is needed, the chef wants to know the surface area of the cheese wheel. What is the total surface area of the cheese wheel in square inches? Use 3.14 for pi (1 point)

62.8 square inches

37.68 square inches

301.44 square inches

94.2 square inches

1 answer

To find the total surface area of the cheese wheel, which is in the shape of a cylinder, we will use the formula for the surface area of a cylinder:

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

Where:

  • \( r \) is the radius of the cylinder,
  • \( h \) is the height of the cylinder.

First, we need to find the radius. The diameter of the cheese wheel is 6 inches, so the radius \( r \) is:

\[ r = \frac{diameter}{2} = \frac{6}{2} = 3 \text{ inches} \]

The height \( h \) of the cheese wheel is given as 2 inches.

Now we can substitute these values into the surface area formula:

  1. Calculate the area of the top and bottom circles (2πr²):

\[ 2\pi r^2 = 2 \times 3.14 \times (3)^2 = 2 \times 3.14 \times 9 = 56.52 \text{ square inches} \]

  1. Calculate the area of the curved surface (2πrh):

\[ 2\pi rh = 2 \times 3.14 \times 3 \times 2 = 2 \times 3.14 \times 6 = 37.68 \text{ square inches} \]

  1. Now, add both areas together to get the total surface area:

\[ \text{Total Surface Area} = 56.52 + 37.68 = 94.2 \text{ square inches} \]

Thus, the total surface area of the cheese wheel is:

\[ \boxed{94.2} \text{ square inches} \]