Question

Find circumference of circle whose radius is 4.2cm

Answer 1

Answer:

circumference=2πr

=2×22/7×4.2

=26.4cm^2

Answer 2

Answer:

Here, radius(r)=4.2cm [ Given ]

⇒ Circumference of circle =2πr

∴ Circumference of circle =2×

7

22

×4.2

∴ Circumference of circle =26.4cm

⇒ Area of circle =πr

2

⇒ Area of circle =

7

22

×(4.2)

2

⇒ Area of circle =

7

22

×17.64

∴ Area of circle =55.44cm

Step-by-step explanation:

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