Find the lateral area of a cone with a radius of 7 ft. and a slant height of 13 ft.

Question

 Use 3.14 for π and round to the nearest tenth.

439.6 ft^2

324.5 ft^2

571.5 ft^2

285.7 ft^2

Answer 1

The lateral area of a cone is r L

where r is the radius but L is the slant height and = 3.14 round to the nearest tenth

The radius r = 7ft

Slant height  L = 13ft

The lateral area of a cone = r L

Substitute r = 7ft and  L = 13ft in the lateral area of cone

The lateral area of a cone = r L

The lateral area of a cone = X 7 X 13

Substitute = 3.14 round to the nearest tenth

The lateral area of a cone = 3.14 X 91

There fore the lateral area of a cone = 285.74sqft.