Question

Ad is the diameter of a circle of radius 6 cm and ab=bc=cdin semi circle ab and bd are diameter find perimeter of shaded area

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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