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2016-03-16T23:20:37+05:30

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Formula = 
1. Perimeter of Semi Circle = r(pie + 2)
2. Area of Semi Circle = 1/2 pie r²

Since Protractor Is Shape Of Semi Circle

Perimeter of Semi Circle(protractor) = r(pie + 2)
                                                         36 = r(22/7 + 2)
                                                         36 = r[(22 + 14)/7]
                                                         36 = r[(36)/7]
                                                            r =36 * 7 / 36
                                                            r = 7 cm

Area of Protractor = 1/2 Pie r
²
                                =  1/2 * 22/7  * 7 * 7
                                = 11 * 7
                                = 77cm
² 

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