Question

answer me please please ​

Answer 1

Answer:

it is so simple.

the point where ab and cd intersects, name it E.

Angle ACB=1/2 Angle AEB --1

Angle ADB=1/2 Angle AEB --2

FROM EQ 1 AND 2

Angle ACB=Angle ADB

JOIN CD.

Angle ACD+Angle ADC= 180 degree

therefore, from calculations

Angle ACD = Angle ADC = 90 degree.

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