Question

Find the area of figure and length of the complete boundary
Length=42
Length of boundary=14

Answer 1

Answer:

1. Length of the boundary

Length of the boundary=perimeter of semi circle with diameter AB boundary of semi circle with diameter 7cm

Length of boundary =(π×7+π×3.5)+π×1.75+π×1.75

Length of boundary =π(7+3.5+1.75+1.75)

                                  =44cm

∴ The length of the boundary is 44cm.

2.Area of shaded region =

Area of largest semicircle + Area of medium semicircle-2 (Area of small semicircle )

Area=722×27×7+722×10035×235−2(722−100×100175×175)

=77+19.25−2(481)

=96.25−9.62

=86.63cm2

Area of shaded region =86.63cm2

Answer 2

Answer:

42×12

=500

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