Question

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Answer 1

Answer:

To prove: A, B,C,D lie on circle that is ABCD is cyclic quadrilateral

PROOF: angle ADC+angle BCD=180°(allied angles)

angle ADC+angle ADC=180°(ADC=BCD)

ADC=90°

angle DAB=angle ABC(angle opposite to equal angles are equal)

similarly, DAB=ABC=90°

so ABCD is cyclic

ABCD lie on circle

HOPE IT HELPS U

Answer 2

Explanation:

if if you measure each of the angles of this this quadrilateral and add the measures of the opposite angles you will find that

Angle A + Angle C = 180°

Angle B + Angle D = 180°

i.e., the sum of the opposite angles is 180°

Hence, was have the following property.

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