Question

The curved surface area of a hemisphere is 77 cm2

. Find its radius.​

Answer 1

Answer:

Le the radius of hemisphere be

′

r cm.

Now, cuoved surface area of hemisphere =2πr

2

⇒2πr

2

=77

⇒r

2

=

2×22

77×7

=

2×2

7×7

⇒r=

21

49

=

2

7

⇒r=3.5cm

Step-by-step explanation:

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Answer 2

Let the radius of hemisphere be   ′  r cm.

Now, curved surface area of hemisphere = 2πr²

2πr² = 77

r² = 77/2 * 7/22 = 7/2 * 2/2

r = √49/21 = 7/2

r = 3.5 cm