Question

26.
Find the ratio of total surface area of a sphere and a hemisphere of
same radius?
or
Find the curved surface area of a cone whose height is 12cm and
base radius is 5cm ?

Answer 1

$\huge\star\red{{Answer}}$

Given :-

• Height and base radius of a cone are 12cm and 5cm respectively.

To Find :-

• Curved surface area of the cone.

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First, we've to find slant height of the cone

l = √ ( 12)² + (5)²

= = > l = √ 144 + 25

= = > l = √169

= = > l = 13 cm

Curved surface area of cone = πrl

= = > 22/7 × 5 × 13

= = > 204.2

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