Question

Question 1.
Find the radius of a circle whose circumference is
(i) 52.8 cm
(ii) 42 cm
(iii) 6.6 km​

Answer 1

Answer:

42 cm

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Answer 2

Before, finding the solution. Let's see on how to find the answer :

Formula for Radius :

$\sf \: C = 2\pi \: r$

Where, C = circumference.

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Given :

Circumference= 52.8 cm

To find :

Radius

Solution :

We know that,

C = 2πr

52.8 = 2 × 3.14 × r

=> 52.8 = 6.28 × r

$\sf \: => r \: = \dfrac{52.8}{6.28}$

Hence, the radius is 8.4 cm.

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Given :

Circumference = 42 cm

To find :

Radius

Solution :

We know that,

C = 2πr

42 = 2 × 3.14 × r

=> 42 = 6.28 × r

$\sf => \: r = \: \dfrac{42}{6.28}$

Hence, the radius is 6.6 cm.

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Given :

Circumference= 3.14 km

To find :

Radius

Solution :

We know that,

C = 2πr

6.6 = 2 × 3.14 × r

=> 6.6 = 6.28 × r

$\sf => \: r = \: \dfrac{3.14}{6.28}$

Hence, the radius is 1.0 km.

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Know more :

• Formula for Radius of Circle

$\sf \: C = 2\pi \: r$