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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