Question

The radius and slant height of a cone are in the ratio 4:7.If its C.S.A is 729.Then find it's radius?

Answer 1

2.6 is the radius bro

Answer 2

$\huge\underline\mathrm{SOLUTION:-}$

AnswEr:

• The radius of the cone = 12 Cm.

Given:

• The ratio of the radius and height of the cone is 4:7

Need To Find:

• The radius of the cone = ?

ExPlanation:

Given that:

• Curved surface area of the cone = πrl

Let the radius of the cone be 4x

And the height of the cone be 7x.

Now,

• Curved surface area = 792

➠ $\mathsf {\frac{22}{7} \times 4x \times 7x = 792}$

➠ 88x² = 792

➠ x² = $\mathsf {\frac{792}{88} = 9 }$

➠ x = 3 cm

• So, the radius of the cone = 4 × 3 = 12 cm.

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