If the quadrilateral ABCD circumscribed ...

If the quadrilateral ABCD circumscribed about the circle , then prove that `AB+ CD= BC+ DA.`

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Answer any One question : If a quadrilateral ABCD is circumscribed about a circle with centre O, prove that AB + CD = BC + DA.

The quadrilateral ABCD is circumsribed about a circle. Prove that AB+ CD= BC+DA.

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Prove that for a quadrilateral circumscribed about a circle, the angles subtended by any two opposite sides at the centres are supplementary to each other.

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ABCD is a cyclic quadrilateral. If AB = DC, then prove that AC= BD.

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If in the cyclic quadrilateral AB||CD , then prove that AD =BC and AC=BD.

Given that the vertices A, B, C of a quadrilateral ABCD lie on a circle. Also angleA + angleC = 180^@ , then prove that the vertex D also lie on the same circle.

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CALCUTTA BOOK HOUSE-THEOREMS RELATED TO TANGENT IN A CIRCLE -EXERCISE 4.2

The centre of a circle with radius of 6 cm is O. The length of the tan...
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If the radius of a circle be zero, then the circle is called a point ...
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Only three tangents can be drawn from a external point of a circle.
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The tangent to a circle and the radius passing through the point of co...
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The number of direct common tangents to two intersecting circles is ""
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The straight line PAB intersects the circle with centre O at the point...
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Two circles touch each other internally. The radius of the larger circ...
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Two circles touch each other externally. The distance between two cent...
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The radius of a circle with centre O is 5 cm. The length of the tangen...
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AB is a diameter of the circle with centre O. The tangent, drawn at a ...
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Prove that form any external point two tangents can be drawn to circle...
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Two tangents are drawn from an external point A of the circle with cen...
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Prove that the internal bisector of the angle between two tangents dra...
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Prove that the internal angle between two tangents drawn from an exter...
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The incircle of Delta ABC touches the sides AB, BC and CA of the trian...
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If the quadrilateral ABCD circumscribed about the circle , then prove ...
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Puja has drawn a circle wit centre of O of which AB is a diameter. Two...
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Laxmi has drawn two circles which intersect each other at O externally...
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Length of radius of two circles are 5cm and 3cm . If two circles touch...
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The radii of two circles are R and r unit (R gtr). If the distance bet...
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