The perimeterof a semi-circle is 72 cm, Its diameter is ______
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Let the radius of semicircle = r Perimeter = πr + 2r = (π+2)r Given that perimeter= 72 cm (π+2)r = 72 => r = 72/(π+2) => r = 72/5.14 = 14 cm Diameter = 2r = 2×14 = 28cm
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Perimeter of semi circle = 72 cm
( πR + 2R ) = 72
R ( π + 2 ) = 72
R ( 22/7 + 2 ) = 72
R ( 22 + 14/7 ) = 72
R ( 36/7 ) = 72
36 * R = 504
R = 14 cm.
Radius of circle ( R ) = 14 cm.
Therefore,
Diameter of circle = 2 × R = 28 cm.
( πR + 2R ) = 72
R ( π + 2 ) = 72
R ( 22/7 + 2 ) = 72
R ( 22 + 14/7 ) = 72
R ( 36/7 ) = 72
36 * R = 504
R = 14 cm.
Radius of circle ( R ) = 14 cm.
Therefore,
Diameter of circle = 2 × R = 28 cm.
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