Question

from a rectangular piece of metal sheet of length and breadth 1.60 m and 80 cm respectively 3 circular sheets of 20 cm radius are cut out what area of metal is left

Answer 1

Length of the metal sheet=1.60m=160cm

Breadth of the metal sheet=80cm

Total area of the metal sheet=l*b
=160*80
=12800


Radius of each circle=20cm

Circumference of circle=
=
=22/7*400
=8800/7

Circumference of 3 circles=8800/7*3
=26400/7
=3771.42(approx.)

Area of metal sheet left= total area of metal sheet-circumference of three circles
=(12800-3771.42)
=9028.58(approx.)


HOPE THIS HELPED YOU...

Answer 2

In the given figure a circle of diameter 21 cm is given inside the circle to circle with diameter 2 by 3 and 1 by 3 of the diameter of the big circle have been drawn as shown in the figure find the area of the shaded region