Question

ABCD is a quadrilateral in which all four angles are equal. Show tha AB||CD and AD||BC.

Answer 1

Step-by-step explanation:

in fig..

it is given that

angle A = angle B= angle C =angle D

if all angles are equal

then angle A + angle B + angle C+ angle D=360°

each angle = 90°

hence they are forming CO -INTERIOR angles

in which sum of two angle is 180°

that is property of parallel line

hence proved

Answer 2

Step-by-step explanation:

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