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प्रश्न
The radii of two circles are 19 cm and 9 cm, Find the radius of the circle which has circumference equal to the sum of the circumferences of the two circles.
उत्तर
Let the radius of the required circle be r.
Now, Circumference of the required circle = Circumference of circle having radius 19 cm + Circumference of circle having radius 9 cm
⇒ 2πr = 2π × 19 + 2π × 9
⇒ r = 19 + 9
⇒ r = 28 cm
Hence, the radius of the required circle is 28 cm.
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