Question

Find the lateral area of a cone with a radius of 7ft. and a slant height of 13ft. Use 3.14 for pi and round to the nearest tenth ? A)439.6 B)324.5 C)571.5 D)285.7

Answer 1

`D) color(blue)(285.7` `sq. ft`

Explanation:

Lateral Surface Area of a cone is given by the formula :

`A_l = pi r l` where r is the base radius of the cone l the slant ht.

Given `r = 7’, l = 13’, pi = 3.14`

`A_l = 3.14 * 7 * 13 ~~ 285.7` sq ft, rounded to one decimal.