Mathematics
Grade9
Easy
Question
Find the lateral area of the following cone.
- 63.21 in2
- 56.52 in2
- 169.56 in2
- 28.3 in2
Hint:
The Formula for lateral surface area of the cone is πrl where l is the slant height and r is the radius of the circular base of the cone.
The correct answer is: 63.21 in2
Given, height of cone h = 6 inches and radius of cone r = 3 inches
Slant height = 
= 
= 6.71 inches
Use the lateral area formula,
Lateral area = πrl
= 3.14 x 3 x 6.71 = 63.21 in2
Therefore, the lateral surface area of the given cone is 63.21 in2
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