Question

what are the boundaries of what are the boundaries of the interval whose mid point is 3.7cm?the interval whose mid point is 3.7cm?

Answer 1

Answer:

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=

7

22

×

2

7×7

+

7

22

×

100

35

×

2

35

−2(

7

22

−

100×100

175×175

)

=77+19.25−2(481)

=96.25−9.62

=86.63cm

2

Area of shaded region =86.63cm

2