Question

please solve this questions

Answer 1

2π×2.1+2π×0.7+2π×1.4
2π(2.1+0.7+1.4)
2π(4.2)
2×22/7×4.2
44×0.6
=26.4/2
=13.2

Answer 2

r₁=2.8+1.4/2 = 2.1cm
r₂=2.8/2 = 1.4cm
r₃=1.4/2 = 0.7cm
perimeter of the shaded region=perimeter of semicircles (ADC+AEB+BFC)
= (πr₁+πr₂+πr₃) (perimeter of semicircle = πr)
= π(2.1+1.4+0.7)
= 4.2π
=4.2 x 22/7
=13.2cm
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