If the perimeter of a semi-circular protractor is 36 \( \mathrm{cm} \), then its radius is
a. \(... VIDEO
If the perimeter of a semi-circular protractor is 36 \( \mathrm{cm} \), then its radius is
a. \( 10 \mathrm{~cm} \)
b. \( 7 \mathrm{~cm} \)
c. \( 8 \mathrm{~cm} \)
d. \( 6 \mathrm{~cm} \)
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