A right cone has an altitude of 4 units and a base diameter of 6 units. What is its lateral area?

A) 37.7 units squared

B) 47.1 units squared

C) 62.8 units squared

D) 75.4 units squared

Lateral area =

pi * (radius) * √ [ height ^2 + radius^2 ] =

pi * ( 4 ) * √ [ 4^2 + 3^2 ] =

pi * ( 4 ) * √25 =

pi * ( 4 ) * (5 ) =

20 pi units^2 ≈ 62.8 units^2