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प्रश्न
The circumference of a circle exceeds its diameter by 45 cm. Find the circumference of the circle.
उत्तर
Let the radius of the circle be r.
Now,
Circumference = Diameter + 45
⇒ 2πr = 2r + 45
⇒ 2πr - 2r = 45
`⇒ 2"r" (22/7 - 1) = 45`
`=> 2"r"xx15/7 = 45`
⇒ r = 10.5 cm
∴ Circumference = Diameter + 45 = 2(10.5) + 45 = 66 cm
Hence, the circumference of the circle is 66 cm.
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