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Question

Find the diameter of the circle whose circumference is 42 cm.

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Solution

Given: The circumference of the circle is 42 cm.

Let the radius and diameter of the circle are r and d, respectively.

We know that,

Circumference =2πr

2πr=42

2(227)r=42

r=147226.68 cm


Since, the diameter of the circle is twice of it radius.

d=2r

d=2(14722)=1471113.36

Thus, the diameter of the given circle is 14711 cm or 13.36 (approx) cm.


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