Question

Find the area of circle whose diameter is 42 CM.​

Answer 1

Step-by-step explanation:

Solution:

Diameter of circle = 42 cm

➜ Radius of circle = 1/2 × 42

➜ Radius of circle = 21 cm

Formula used here:

Area of circle = πr²

Putting the values:

➪ Area of circle = 22/7 × 21 × 21

➪ Area of circle = 1386 cm²

Therefore:

The area of the circle is 1386 cm².

Answer 2

Answer:

Find the area of a circle whose diameter is 42cm use(π=22/7)

----------

r = 21 cm

Given, radius r=21cm and π=

7

22

Then,

Area of the circle = πr

2

sq units

=

7

22

×21×21

=22×3×21

=1386cm