Question

please tell the answer of q 18

Answer 1

Answer:

BC=diameter of the circle=14cm

so radius of the circle=14/2=7cm

area of the circle =pi*r^2

=22/7*7*7=154cm^2

so area of three circles =154*3=462cm^2

sum of diameters of the three circles (in a horizontal way) gives the breadth of the rectangle.

so length of rectangle=14cm

breadth of rectangle =14*3=42cm

area of the rectangle = length *breadth=14*42=588cm^2

so area of the shaded figure=area of rectangle-area of the three circles

=588-462=126cm^2

so the area of shaded figure=126cm^2

Step-by-step explanation:

Answer 2

Given:

Side of BC=14cm=diameter of circle practically.

Length of AB=14+14+14=42cm

To find:

Area of shaded portion=area of rectangle-sum of areas of three circles.

Solution:

Area of rectangle ABCD=AB*BC

=>14*42

=>588cm^2-----------------(1)

Now, area of circle=(pi) *r^2

=>22/7*14*14

=>616cm^2

Thus, total area of 3 circles=616*3

=>1848cm^2

Finally, subtract (1) from 1848,we get,

1848-588

=>1260cm^2

Hope it'll help you:)