Question

Find the area of the circle with:
[i] radius = 4.2 m
[ii] diameter = 42 m​

Answer 1

Area of circle = πr²

(i) r = 4.2 m

=> Area = πr²

= 22/7 × 4.2 × 4.2 m²

= 22/7 × 42/10 × 42/10

$\: \: \: \: \: = \frac{22}{7} \times \frac{42}{10} \times \frac{42}{10}$

$\: \: \: \: \: = \frac{11 \times 6 \times 21}{5 \times 5}$

$\: \: \: \: \: \: = \frac{1386}{25}$

= 55.44 m²

(ii) d = 42

r = 42/2

Area = πr²

$\frac{22}{7} \times \frac{42}{2} \times \frac{42}{2}$

$\frac{11 \times 6 \times 21}{1}$

1386 m²

Thank You !