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Circles

RD Sharma

CBSE

Grade 10

Question:

If the perimeter and the area of a circle are numerically equal, then the radius of the circle is:
(a) $2$ units
(b) $\pi$ units
(c) $4$ units
(d) $7$ units

Step-by-Step Solution

Key Concept: $2 \pi r = \pi r^2 \Rightarrow r = 2$ units.

$2\pi r = \pi r^2 \Rightarrow r = 2$. [1.0 Mark]

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🎯 Official CBSE Marking Scheme:
Solving $r = 2$ units: 1.0 Mark

Correct Answer: $2$ units

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