The height and radius of the right circular cone is 4 cm and 3 cm respectively. What is the total surface area of the cone?
Answer & explanation
Correct answer: option 2
We know that,
l2 = r2 + h2
The total surface area of the cone = πr(l + r)
We have,
Height = 4 cm
Radius = 3 cm
l2 = 42 + 32
l = \(\sqrt {16 + 9}\) = 5 cm
Now, The total surface area of the cone = π × 3 × (5 + 3) = 24π cm2