the area enclosed by the circumference of two concentric circles is 423.5cm square . If the circumference of outer circle is 132 cm . Calculate the radius of the inner circle
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the area enclosed by the circumference of two concentric circles is 423.5cm square . If the circumference of outer circle is 132 cm . Calculate the radius of the inner circle
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Answer:
17.5
Step-by-step explanation:
circumference of circle = 2pi r
132 = 2 ×22/7 × r
r= 21
Area of the between two circles is = A2-A1
( AREA OF THE CIRCLE = PI R ^ 2
= PI R1 ^2 - PI R2^2
= 22/7 × 21^2 - 22/7 × R2^2 ( 'R2 = 21)
= 17.5