Question

Help!!

What is the surface area of the right cone below?
O
A. 176 sq. units
O
B. 284 sq. units
O
C. 138 sq. units
O
D. 90 sq. units

Answer 1

The surface are of the right cone is 176 sq.units. Option A) is the correct answer.

Explanation:

step 1 :

Radius of the cone, r = 4

Height or length of the cone, h = 10

step 2 :

Total surface area of right cone = πrh + πr^2

= (π
`*`4
`*`10) + ( π
`*`4^2)

= 40π + 16π

= 56 π = 56
`*`3.14

= 176 sq.units