Question

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Answer 1

Answer:

refer to the attached picture. hope it will help you to understand

Answer 2

Step-by-step explanation:

2x + x+ < COE =180°

3x + < COE =180°

given, < COE =90°

hence we get

3x + < COE =180°

3x + 90° =180°

3x =180° - 90° =90°

x = 90°/3 = 30° .

now, 2x and y are opposite angles, hence they are equal.

y =2x =2×30° =60° .

now, z+y =180°

z = 180° -60°=120° .