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Maths-

General

Easy

Question

Find the area and circumference of the dollar coin

hint Hint:

Given the diameter of the circle .Find the radius of circle then Find the circumference of the circle by using the formulas circumference of circle $equals 2 pi r$ and area of circle = $2 pi r$ .

The correct answer is: The circumference of a circle is 9.4247 cm and the area of the circle is 7.0685 sq.cm

ANS :- The circumference of a circle is 9.4247 cm and the area of the circle is 7.0685 sq.cm.
Explanation :-
Given, the diameter of circle = 2r = 3 cm
Then the radius of circle r = 1.5 cm
Then we get circumference of circle $equals 2 pi r$
$equals 2 pi left parenthesis 1.5 right parenthesis$
$equals 3 pi cm$ = 9.4247 cm
The circumference of a circle is 9.4247 cm
Then we get area of circle = $pi r squared$
$equals pi left parenthesis 1.5 right parenthesis squared$
$equals 2.25 pi cm squared$
= 7.0685 sq.cm
The area of the circle is 7.0685 sq.cm.
∴The circumference of a circle is 9.4247 cm and the area of the circle is 7.0685 sq.cm.

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