Question

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Answer 1

Step-by-step explanation:

1) Name the triangle ABC.

The ray from angle A should be named D.

Angle DAC and angle CAB form linear pair.

Therefore, angle DAC + angle CAB = 180°

But, angle DAC = 70°

Therefore, 70° + angle CAB = 180°

Therefore, angle CAB = 180°- 70°

Therefore, angle CAB = 110°

2) 90° + 50° + X = 180° ( Angle sum property )

140° + X = 180°

Therefore, X = 180° - 140°

Therefore, X = 40°

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Answer 2

Answer:

(a) 30 (b) 40°

Step-by-step explanation:

(a) 40°+x= 70°.

x= 70° - 40°

x= 30°

(b) 90°+50°+x = 180°[ by angle sum property]

x= 180°- 140°

x= 40°