Answer:
Explanation:
We know that the straight line are supplementary angles(180°).
∠A + ∠B = 180° ................ (1)
According to given conditions,
∠A = 4(∠B + 17.5°)
∠A = 4∠B + 70°
∠A - 4∠B = 70° ............ (2)
Subtract the Equation (1) from (2) we get .
5∠B = 110
∠B = 22° .............. (Divide both side by 5)
Put the vatue of ∠B in equation (1)
∠A + 22° = 180°
∠A = 158°