The radii of two circles are 19 cm and 9 cm respectively. Find the radius of the circle which has
circumference equal to the sum of the circumferences of the two circles.
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Answer:
r = 28
Step-by-step explanation:
r1= 19, r2= 9, r3= r
According to the question,
2πr1 + 2πr2 = 2πr3
2 x 22/7 x 19 + 2 x 22/7 x 9 = 2 x 22/7 x r
836/7 + 396/7 = 44r/7
1232/7 = 44r/7
308r = 8624
r = 28
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