Question

EXERCISE 17.2
Find the area of circle whose radius is:
(i) 21cm (ii) 49dm (iii) 217cm​

Answer 1

Step-by-step explanation:

Area=

$\pi \: r {}^{2}$

1)

$\frac{22}{7} \times 21 \times 21 = 1386 \: cm {}^{2}$

2)

$\frac{22}{7} \times 49 \times 49 = 7546 \: cm {}^{2}$

3)

$\frac{22}{7} \times 217 \times 217 = 147994 \: cm {}^{2}$

Answer 2

Step-by-step explanation:

Question : Find the area of circle whose radius is :-

ANSWERS :-

1. 21 cm

ans -- radius = 1386cm²

2. 49cm

ans -- radius = 7546cm²

3. 217 cm

ans radius = 147994 cm²