one circle has a radius of 90 cm and a second concentric circles has a radius of 1 m 26 cm how longer is the circumference of the second circle then that of the first ?
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= 176 cm Ans. Ans.) The circumference of the second circle is 176 cm longer than that of the first.
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Given:-One circle has a radius of 98 cm and a second concentric circle has a radius of 1 m26 cm or 126cm
To find out:-How much longer is the circumference of the second circle than that of first?
Solution:-
Let the radius of outer circle be r1 and inner circle be r2 .
CIRCUMFERENCE of inner circle = 2πr1
=>2×22/7×98
=>616 cm
CIRCUMFERENCE of outer circle = 2πr2
=>2×22/7×126
=>792 cm
DIFFERENCE of outer circle and inner circle
=>792-616=176 cm
circumference of the second circle is 176 cm longer than that of first.
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