Find the perimeter of semicircle who's radius is 2.8cm
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19
Radius of semi circle = 2.8 cm
Perimeter of semi circle = Length of arc + Diameter
= pi r + 2r
= 22×2.8 / 7 + 2× 2.8
= 22 × 0.4 + 5.6
= 8.8 + 5.6
= 14.4 cm
Perimeter of semi circle = Length of arc + Diameter
= pi r + 2r
= 22×2.8 / 7 + 2× 2.8
= 22 × 0.4 + 5.6
= 8.8 + 5.6
= 14.4 cm
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10
perimeter of circle=2πr
perimeter of semicircle=1/2×2πr+2r
=r(π+2)
=2.8(22/7+2)=14.4cm
perimeter of semicircle=1/2×2πr+2r
=r(π+2)
=2.8(22/7+2)=14.4cm
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