`(OA)/(OC)=(OD)/(OB)`. Prove that `angleA= angleC` and `angleB= angleD`.

ABCD is a quadrilateral in which AB||DC and AD = BC. Prove that angleA=angleB and angleC= angleD .

In Fig.4.126,(OA)/(OC)=(OD)/(OB) .Prove that /_A=/_C and /_B=/_D.( FIGURE )

In the given figure, OC.OD = OA.OB Show that : angle A = angle D " and " angle C = angle B.

In a triangleABC if angleA=72^(@) and angleB=63^(@) ,find angleC

In a triangle ABC, angleA lt angleB, angleB gt angleC and angleA=2angleC , prove that AC gt BC gt AB .

The following steps are involvedd in finding the angles of the triangles ABC, when angleA: angleB: angleC=1:2:3 . Arrange them in sequential order. (A) Let the angle be angleA=x, angleB=2x and angleC=3x . (B) Given angleA: angleB: angleC=1:2:3 (C ) angleA=30^(@),angleB=2(30^(@))=60^(@) and angleC=3(30^(@))=90^(@) . (D) angleA+angleB+angleC=180^(@)implies x+2x+3x=180^(@) (E ) 6x=180^(@)impliesx=30^(@)

In the figure.If ("OA")/("OD")=("OC")/("OB") , then which pair of angle are equal?

If bisectors of angleA and angleB of a quadrilateral ABCD intersect each other at P, of angleB and angleC at Q, of angleC and angleD at R and of angleD and angleA at S, then PQRS is a

In a rhombus ABCD, if angleA=60^(@) find angleB, angleC&angleD .

In DeltaABC,2angleA=3angleB=6angleC , then find angleA .