Question

Find the total lateral area of the following

cone. Leave your answer in terms of a.
4 cm
3 cm
LA = ? cm2

Answer 1

15π cm²

Explanation:

The total lateral area of a cone

= πr√h² + r²

= √h² + r² = l

h = Height = 4cm

r = radius = 3cm

Hence:

= π × 3 √4² + 3²

= 3π × √16 + 9

= 3π × √25

= 3π × 5

= 15π cm²