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Step-by-step explanation:
as we know ad = 30 degree
and ad is equal to ab
ab will be 30 degree
angle a will be 60 degree
angle a means only a part no d and b involved in it.
as we know bc = 50 Degree
bc = CD
CD = 50 degree
angle b = 80 degree
angle c = 100 degree
angle d = 80 degree
angle b and angle d are also equlitateral.
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