Question

answer the following ​

Answer 1

Answer:

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Answer 2

angle A : angle B : angle C = 3 : 2 : 1

A = 3x ; B = 2x ; C = 1x

3x + 2x + 1x = 180° => x = 30°

so, angle C = 1x = 30°

Angle C + Angle ACE + Angle ECD = 180°

30° + 90° + ECD = 180° => ECD = 60°

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