Question

The total surface area of a hemi sphere is 90 sq.cm then what will be its curved surface area ​

Answer 1

Step-by-step explanation:

Given :-

The total surface area of a hemi sphere is

90 sq.cm.

To find:-

what will be its curved surface area of the hemi sphere.

Solution:-

Total surface area of the hemi sphere=3πr²

given that=90 cm²

=>3πr²=90

=>r²=90/3π

=>r²=30/π

r=√(30/π/)cm

now

Curved surface area of the hemisphere=2πr²

=>2π(√(30/π)²

=>2π×30/π

=>2×30

=>60cm²

or

Short cut:-

3πr²=90

πr²=90/3

=>πr²=30

2πr²=2(30)=60

Answer:-

Curved Surface Area of Hemi sphere=60cm²