In the given figure PA,PB are the tagents from the point P.Let O be the centre of the circle.If `/_APB=40^@`.
. Calculate `/_AOB`.

In the figure, O is the centre of the circle squareA=60^o . squareC =______ .

In the given figure radius of the circle is 2 units. Find the length of arc APB .

In the figure, O is the centre of the circle squareA=60^o . squareBOD =______ .

In the figure, O is the origin and A(8,0), B(0,6) are two points.Write the coordinates of the centre of the circle with AB as diameter. .

In the figure PA,PB and RS are the three tangents to the circle. Prove that the perimeter of /_\PRS is the sum of the lengths PA and PB.

In the figure, tangents PA and PB are drawn to a circle with centre O from an external point P. If CD is a tangent to the circle at E and AP=25cm, find the perimeter of /_\PCD .

In the figure,AB is the tangent at B of the circle centred at O.How much is /_OBA ? How much is /_AOB ?

In the figure, O is the origin and A(8,0), B(0,6) are two points.Write the equation of the circle with AB as diameter. .

If (4,0) is a point on the circle x^(2)+ax+y^(2)=0 , then the centre of the circle is at

In the figure, C,D are points on the circle AD is a diameter of the circle. squareC=30^o . AB=4 centimetres. squareABD =_____ .