Question

diameter of the base of a cone is 10.5cm and its slant height as 10cm . find its csa

Answer 1

r= 10.5/2
r = 5.25 cm
slant height (l) = 10 cm

so its curved surface area = πrl
now ,
= 22/7 × 5.25 × 10
= 22/7 × 525/100 × 10
= 22× 75/100 ×10
= 165 m^2 is the answer

Answer 2

Right circular cone:

If a right angled triangle is revolved about

one of the two sides forming a right angle keeping the other side fixed in

position then the solid so obtained by segments is called right circular cone.

Slant height:

The

length of the line segment joining the vertex to any point on a circular edge

of the base is called the slant height of the cone.

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Given: Diameter= 10.5 cm

Radius (r) = 10.5/2 cm = 5.25 cm

Slant height (l) = 10 cm

Curved surface area of the cone = (πrl)

=(22/7 × 5.25 × 10)

=165 cm²

Hence, the curved surface area of a cone =165cm²

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Hope this will help you ..