Question

Find the perimeter of a semi circular disc of radius 4.27

Answer 1

ANSWER

Perimeter of a semi circular plate =πr+2r

Given, πr+2r=86.4

      =>r(π+2)=86.4

      =>r=π+286.4

      =>r=722+286.4

      =>r=73686.4

      =>r=3686.4×7

      =>r=16.8 cm

Area of a semi circle =2πr2

                                    =7×222×16.82

                                    =443.52cm2

Answer 2

Answer:

21.96

Step-by-step explanation:

perimeter =0Half circumference + Diameter

= πr + 2r

=22/7*4.27 + 2*4.27

=13.42+8.54

= 21.96