Question

10. A window is in the shape of a semicircle having its
diameter as 140 cm. Find the cost of framing the
window at the rate of 5 per cm. Also, find the
cost of putting glass at the rate of 31 per cm².​

Answer 1

Answer:

Cost of putting glass =31×7700=Rs.238700

Step-by-step explanation:

Radius of semicircle =

2

d

=

2

!40

=70cm

Perimeter of semicircle =πr=

7

22

×70=220cm

Rate of framing =Rs.5 per cm

Therefore,

Cost of framing the window =5×220=Rs.1100

Also,

Area of semicircle =

2

1

πr

2

=

2

1

×

7

22

×70×70=7700cm

2

Rate of putting glass =Rs.31 per cm

2

Therefore,

Cost of putting glass =31×7700=Rs.238700