A right cone has an altitude of 4 units and a base diameter of 6 units. What is its lateral area?
The lateral area is given by : pi * R * L where R is the cone's radius and L is the slant height
The slant height ,L, is given by √[ cone height^2 + radius^2] = √[4^3 + 3^2]= √25 = 5
So....the lateral area =
pi * 3 * 5 =
15 pi units^2
