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