Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 2D

Question:

If the height and slant height of a right circular cone are 8 cm and 10 cm, respectively, then the volume of the cone is (use π = $\frac{22}{7}$ ): ( correct the two decimal places)

Options:

200 cm3

301.71 cm3

258 cm3

299.45 cm3

Correct Answer:

301.71 cm3

Explanation:

Given,

Height =  8 cm

Slant height = 10 cm

We know that,

l2 = r2 + h2

Where, h = height

r = radius and l = slant height

102 = r2 + 82

= 100 = r2 + 64

r2= 100 - 64 = 36

r = 6

We know that the volume of the cone = \(\frac{1}{3}\)πR2H  

= \(\frac{1}{3}\) × \(\frac{22}{7}\) × (6)2 × 8 = 301.71 cm3