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Answer : 40°
explanation →
In ΔABC
∠ACB = 180 - 50 + 90 [ANGLE SUM PROPERTY]
∴∠ACB = 40°
Now in ΔECD,
∠ACB = ∠ECB [SAME ANGLES]
∴∠EDC = 180 - ∠DEC + ∠ECD
∴∠EDC = 180 - 100 + 40
∴∠EDC = 40°
THEREFORE YOUR ANSWER IS 40°
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