math10-3

Question

Answer 1

Step 1:

The diameter of the conical pile is .

The radius of the conical pile is .

Substitute in .

.

The slant height is .

Step 2:

Find the surface area of the conical pile exposed to the air.

Surface area of the cone: .

Substitute and in .

.

The surface area of the conical pile exposed to the air is .

Solution:

The surface area of the conical pile exposed to the air is .