Question

15. An aeroplane has 20 circular glass windows of radius 70 cm. Find the area of the glass
used in these windows,
16. A mirror with radius 49 cm has a wooden frame of thickness 70 mm. How much area of
the mirror is covered with the frame? What is the visible area of the mirror?​

Answer 1

Answer:

The area of 20 circular glass windows is 308000 sq.cm.

Step-by-step explanation:

Radius of window = 70 cm

Area of circular window = \pi r^2πr

2

Area of circular window =\frac{22}{7} \times 70^2

7

22

×70

2

Area of circular window =15400 cm^215400cm

2

Area of 20 circular glass windows = 15400 \times 20 = 308000 cm^215400×20=308000cm

2

Hence The area of 20 circular glass windows is 308000 sq.cm.