Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 3D

Question:

If the height of a cone is 16 cm and its base radius is 12 cm, then its curved surface area is ($\pi$ = 3.14)

Options:

750.6 cm2

752.6 cm2

753.2 cm2

753.6 cm2

Correct Answer:

753.6 cm2

Explanation:

Height of cone, h = 16

Base radius, r = 12

Let slant height be "l"

$l^2 = h^2 + r^2$

$l^2 = 16^2 + 12^2$ = 256 + 144 = 400

l = 20 cm

Curved Surface area = Πrl = Π*12*20 = 240Π

The correct answer is Option (4) → 753.6 cm2