Question

Radius of a circle is 21cm, find its area and circumference/perimeter​

Answer 1

Answer:

Step-by-step explanation:

C= πd / 2πr

π= 3.14 or 22/7

2πr= 2(22/7)x21

       solve=

        44/7x21

        44x3

        = 132cm

circumference is 132cm.

Answer 2

Given :

Radius Of Circle = 21 cm.

To Find :

Area and Perimeter Of Circle.

Solution :

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Area Of Circle =

$\pi {r}^{2} \\ \\ = > \frac{22}{7} \times 21 \times 21 \\ \\ = > 1386 \: \: c {m}^{2}$

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Perimeter Of Circle =

$2\pi\ r = > 2 \times \frac{22}{7} \times 21 = > 132 \: \: \: cm$

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