The angle made at the centre of a circle is …….

The whole angle at the centre of a circle is :

The angle subtended at the centre of a circle , by a chord whose length is equal to the radius of the circle will be

In the given figure, /_DBA=2 /_DAB = 4/_ CAD . If /_ ADC =120^(@) , then the angle made by AB at the centre of the circle is

In the given figure, AB is the diameter and /_ADC = 2 /_BDC . If /_ BCD =70^(@) , then find the angle made by AC at the centre of the circle.

In the diagram above, A,B,P and Q are points of contacts of direct common tangents of the two circles. If angle ACB is 120^@ , then find the angle between the two tangents and angle made by PQ at the centre of same circle.

Prove that the front angle formed at the centre of a circle by an arc, is double of the angle formed by the same arc at any point on the circle.

The front angle formed at the centre of a circle by an are is half of the angle fromed by the same are at any point on the circle.

In a pie chart, the total angle at the centre of the circle is