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Areas Related to Circles
NCERT Exemplar
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: Set $2\pi r = \pi r^2 \Rightarrow r = 2$.
$2\pi r = \pi r^2 \Rightarrow r = 2$ units. [1.0 Mark]
--- 🎯 Official CBSE Marking Scheme: Equating $2\pi r = \pi r^2 \Rightarrow r = 2$ units: 1.0 Mark
Correct Answer:$2$ units
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