One mark exercise problems — task. Mathematics State Board, Class 7.

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1. Formula used to find the circumference of a circle is

$\pi r^2 \ sq. \ units$
$\pi r^3 \ cu. \ units$
$2 \pi r \ units$
$\pi r^2 + 2r \ units$

2. In the formula,

$C = 2 \pi r$ , '

$r$ ' refers to .

3. If the circumference of a circle is

$82 \pi$ , then the value of '

$r$ ' is .

4. Circumference of a circle is always .

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