Question

ad is the diameter of a circle of radius 6 cm and ab=bc=cd.semi circles are drawn with ab and bd as diameters as shown in the figure .find the perimeter of the shaded region

Answer 1

radius=6cm
so diameter=12cm
we know ab=bc=cd
so 12/3=4cm
area of perimeter of upper semicircle
=(2*22*radius/14)+diameter
=18.85+12
=30.85cm
perimeter of shaded region in lower circle
=(2*22*radius/14)+diameter
=6.28+4=10.28cm
peimeter of unshaded region in upper circle
=(2*22*radius/14)+diameter
=12.57+8=20.57
perimeter of shaded portion=perimeter of shader region in upper circlr+perimeter of shader region in lower circle
=(30.85-20.57)+10.28
=10.28+10.28
=20.56
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Answer 2

20.56cm is the right answer.