Question

Q). find area of circle whose circumference is 22cm ?

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Answer 1

Answer:

circumference=22cm

2πr = 22

2 × 22/7 × r = 22

r = 22 × 7/22 × 1/2

r=3.5 cm

area = π r^2

= [22/7 × 3.5 × 3.5 ] cm^2

=38.5 cm^2

Step-by-step explanation:

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Answer 2

Given :

• The circumference of the circle is 22cm.

To Find :

• Find the area of the circle ?

Solution :

• Circumference of circle = 22cm.

➣ 22πr = 22cm

➣ 22 × 22/7 × r = 22cm

➣ Radius = 22 × 7 / 2 × 22

• Cancelling both 22 digits.

➣ Radius = 7/2 cm.

Now,

➣ Area of circle = πr²

➣ Area of circle = 22/7 × (7/2cm)²

➣ Area of circle = 22/7 × 7/2 cm × 7/2 cm

• Cancelling both digits 22/7 & 7/2.

➣ Area of circle = 11 × 7 / 2

➣ Area of circle = 77/2 cm²

➣ Area of circle = 38.5cm²

Hence,

• The area of the circle is 38.5cm².