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bisectors of A and B respectively) - we ...

bisectors of A and B respectively) - we have Sum of the angles of a triangle is 180°) ABS + ZASB 180° 90 ZASB 180° ZASB - 90° ZRSP 90° LASB and ZRSP are vertically opposite angles :. ZRSP - ZASB . ZRQP = 90° and ZSPQ = 90° we can prove that SRQ = 90°, ER RS is a rectangle. ** Q.E.D. ILLUSTRATIVE EXAMPLES LEVEL-1 lelogram ABCD, prove that sum of any two consecutive angles is 180° BCD is a parallelogram. Therefore, AD || BC. 1 In a parallelogre ON Since ABCD Fig. 13.20 DI BC and transversal AB intersects them at A and B respectively. of the interior angles on the same side of the transversal is 1809

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