The lateral area of a right cone which has a base diameter of 4 units and a height of 10 units is:
A) 251.2 units squared.
B) 125.6 units squared.
C) 64.0 units squared.
D) 31.4 units squared.
Radius = Diameter/2
R =4/2 =2
Vertical Height =10
10^2 + 2^2 =Slant Height
Slant Height =10.198
Lateral Area = Slant height x Pi x Radius
=10.198 x 3.141592 x 2
=~64 units squared
+252 
