if the circumference of a circle exceeds its diameter by 30cm,find the radius of circle.
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let the radius be r cm diameter =2r cm. Circumference = 2×22/7 ×r cm
so 2×22/7×r -2r =30
or,2r(22/7-1) =30
or 2r(15/7 ) =30
or r= 7
so radius = 7 cm ( ans)
so 2×22/7×r -2r =30
or,2r(22/7-1) =30
or 2r(15/7 ) =30
or r= 7
so radius = 7 cm ( ans)
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hope this will help
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