if the perimeter of the semi- circular protactor is 66 cm. find its raius.
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πr+2r=66,
r(π+2)=66,
r(22/7 + 2)=66,
r(22+14)/7 =66,
r×36/7 =66,
then
r=66×7/36,
r=11×7/6,
r=77/6 cm
r(π+2)=66,
r(22/7 + 2)=66,
r(22+14)/7 =66,
r×36/7 =66,
then
r=66×7/36,
r=11×7/6,
r=77/6 cm
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