Question

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Answer 1

Answer:

16) the value of x = angle doa. [vertically opposite angles]

therefore, x = 90°

By angle sum property of triangle COB:-

angle cob + angle cbo + angle angle bco =180°

90° + 30° + y = 180°

120 + y = 180

Therefore, y = 60°

now, y = z. [alternate interior angles]

therefore, z = 60°.

17) angle B =angle D. [opposite angles]

angle D = 80°

now, angle D + angle C = 180° [co-interior angles]

80 + angle c.= 180

Therefore, angle C = 100°

angle c = angle a. [opposite angles]

Hence, angle A = 100°