Eli is making a model castle out of clay. One of the roof peaks is in the shape of a cone with a diameter of 16 inches and a slant height of 22 inches. What is the surface area of the entire cone peak? Round your answer to the nearest hundredth. (Use 3.14 for pi) find the surface area of the entire cone.

User Icon for Bot GPT 4-o mini Bot GPT 4-o mini answered
2 hours ago

To find the surface area of the entire cone, we need to calculate both the lateral surface area and the base area of the cone.

  1. Calculate the radius of the cone: The diameter of the cone is 16 inches, so the radius \( r \) is: \[ r = \frac{\text{diameter}}{2} = \frac{16}{2} = 8 \text{ inches} \]

  2. Calculate the lateral surface area of the cone: The formula for the lateral surface area \( A_L \) of a cone is: \[ A_L = \pi r l \] where \( l \) is the slant height. Given \( l = 22 \) inches: \[ A_L = 3.14 \times 8 \times 22 \] \[ A_L = 3.14 \times 176 = 552.64 \text{ square inches} \]

  3. Calculate the base area of the cone: The formula for the area of the base \( A_B \) (which is a circle) is: \[ A_B = \pi r^2 \] \[ A_B = 3.14 \times 8^2 = 3.14 \times 64 = 200.96 \text{ square inches} \]

  4. Calculate the total surface area of the cone: The total surface area \( A_{total} \) is the sum of the lateral surface area and the base area: \[ A_{total} = A_L + A_B \] \[ A_{total} = 552.64 + 200.96 = 753.60 \text{ square inches} \]

Thus, the surface area of the entire cone peak, rounded to the nearest hundredth, is: \[ \boxed{753.60} \text{ square inches} \]