Question

Please answer the above question.
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Answer 1

4b +75+b=180 (straight line)

5b=180-75

5b=105

b=21°-----(i)

2c=75+b (opposite angles are equal at the point of intersection)

2c=75+21 (from equation i)

2c=96

c=48

4b=a (opposite angles are equal at the point of intersection)

4(21) =a

a=84