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Areas Related to Circles
RD Sharma
CBSE
Grade 10

Question:

The radii of two circles are $19\text{ cm}$ and $9\text{ cm}$ respectively. The radius of the circle which has circumference equal to the sum of circumferences of two circles is:
(a) $28\text{ cm}$
(b) $10\text{ cm}$
(c) $20\text{ cm}$
(d) $14\text{ cm}$

Step-by-Step Solution

Key Concept: $R = R_1 + R_2 = 19 + 9 = 28\text{ cm}$.
$R = 19 + 9 = 28\text{ cm}$. [1.0 Mark]

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🎯 Official CBSE Marking Scheme:
Evaluating radius $= 28\text{ cm}$: 1.0 Mark

Correct Answer: $28\text{ cm}$
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