please solve this question.
Answer of this question is 50 degree.
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Here's your answer.
Angle B and C are 90°..........By Observation.
And also bye the sum of all angles of triangle for angle B.
Sum of remote angles is equal to exterior angel.
Therefore angle A = 100+40°
= 140°.
Sum of a quadrilateral=360°.
140°+90°+90°+ADC=360°.
140+180+ADC=360°.
220°+ADC=360°.
ADC= 360°-220.
ADC=40°.
Option (a) is the right answer.
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Good Afternoon.
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