Areas Related to Circles
NCERT Exemplar Ch 10
CBSE_NCERT_EXEMPLAR_CH10
Grade 10
Question:
If the perimeter and the area of a circle are numerically equal, then the radius of the circle is:
$2$ units
$\pi$ units
$4$ units
$7$ units
Step-by-Step Solution
Key Concept: Set $2\pi r = \pi r^2 \Rightarrow r = 2$.
Stepwise Solution:
$2\pi r = \pi r^2 \Rightarrow r = 2$ units. [1.0 Mark]
Marking Scheme:
• Equating $2\pi r = \pi r^2 \Rightarrow r = 2$ units: 1.0 Mark
Correct Answer: $2$ units
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