edithonwunali78 edithonwunali78

24-08-2020
Mathematics

contestada

calculate the perimeter of a semi circle whose radius is 21cm

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salukhalid salukhalid

24-08-2020

Radius of semicircle r = 21 cm

Perimeter of semicircle

= pi*r + 2r

= (22/7)*21 + 2*21

= 22*3 + 42

= 66 + 42

= 108 cm

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