Question

Circles having different radii but the same centre are called _____ .
(1) adjacent circles
(2) semicircles
(3) intersecting circles
(4) concentric circles

Answer 1

Circles having different radii but the same circles are called concentric circles. Option 4 is the right answer. Concentric circles are circles with a common center. The region between two concentric circles of different radii is called an annulus.

Answer 2

Circles having different radii but the same centre are called Concentric circles. So, The correct answer is Option (4).

Constructing Concentric circles,

• Select a point which will be your centre of the circles.

•Set a required Radius and draw a circle

• With the same centre, change Radius and draw one more circle.

This way you can construct Concentric circles.

We can draw a pair of tangents from a point bigger of the both.

Examples of Concentric circles,

•Path around a circular park

• race track for running & relays.