Q12 of 31 Page 183

The circumference of the incircle of a square of side 14 cm is—


Let ABCD be the square with side 14 cm.


⇒ BC = 14 cm


Let the circle centered at E be the incircle of the ABCD.


BC = diameter of the circle = 14 cm


⇒ Radius of the circle = 7 cm


Given that radius of the circle = 7 cm


We know that circumference of the circle = 2πr


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8

In the given figure, AB is a diameter, AC = 6 cm, BC = 8 cm. Find the shaded region.

 9

Find the area of the shaded design in the figure, where ABCD is a square of side 10 cm and semicircles are drawn with each side of the square as diameter (use π = 3.14).

 10

In the given figure, radius of the semicircle is 7 cm. Find the area of the circle drawn inside the semicircle.

 11

If the sum of circumferences of two circles of radii R1 and R2 is equal to the circumference of a circle of radius R, then which of the following choices is correct?