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RS Aggarwal Solutions Class 9 Mathematics Solutions for Volume And Surface Area Of Solids Exercise 15C in Chapter 15 - Volume And Surface Area Of Solids

Question 2 Volume And Surface Area Of Solids Exercise 15C

Find the total surface area of a cone, if its slant height is 21m and the diameter of its base is 24m.

Answer:

ANSWER:

It is given that

The diameter of the cone = 24m

Radius of the cone = 24/2 = 12m

The slant height of the cone = 21m

We know that

Total surface area of a cone = πr (l + r)

By substituting the values

Total surface area of a cone = (22/7) × 12 (21+12)

On further calculation

The total surface area of a cone = (22/7) × 12 × 33

So we get

The total surface area of a cone = 1244.57 m2

Therefore, the total surface area of a cone is 1244.57 m2.

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