Question

5. The circumference of two concentric circles are 121 cm and 154 cm. Calculate the differencebetween their radi​

Answer 1

Answer:

5.25 cm

Step-by-step explanation:

Circumference of circe = 2 pi r

Circumference of circle 1 = 121 cm

2 pi r1 = 121

2 × r1 × 22/7 = 121

r1 = (121× 7) / (22 ×2)

r1 = 77/ 4 cm

r1 = 19.25 cm

2 pi r2 = 154 cm

2 × r2 × 22/ 7 = 154

r2 = (154 × 7) / (22 × 2)

r2 = ( 7 ×7 ) / 2

r2 = 24.5 cm

r2 - r1 = 24.5 - 19.25

r2 -r1 = 5.25

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