Question

the sum of the raddi of two circle is 7cm and the difference of there circumference is 8cm find the circumference of the circle​

Answer 1

Answer:

Step-by-step explanation:

Let the radii of two circles be 'R' and 'r' cm

R + r = 7 cm - - - - - - - (1)

2 × 22/7 ( R- r) = 8

R - r = 8 × 7 / 2 × 22

R- r = 14/11 - - - - - - - (2)

From (1) and (2),

R + r = 7

R - r = 14/11

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2R = 14/11 + 7

2R = 91/11

R = 4.2 cm

r = 2.8 cm