What is the surface area, in square inches, of a cone with a radius of 10 inches and a slant height of 15 inches? Use 3.14 for pi.
a. 471 square inches
b. 2,198 square inches
c. 785 square inches
d. 1,177.5 square inches
The surface area of a cone is given by the formula:
SA = πr(r + l)
where r is the radius and l is the slant height.
Plugging in the values, we have:
SA = 3.14(10)(10 + 15)
SA = 3.14(10)(25)
SA = 3.14(250)
SA = 785 square inches
So the answer is c. 785 square inches.
1. 785 square inches
2. 1,354.125 square centimeters
3. 452.16 square centimeters
4. 226.08 square feet
5. 942 square centimeters