Answer:
Explanation:
We can start by recognizing that straight lines are equivalent to 180 degrees, and the fact that angles opposite each other are congruent. This means that b° is equal to 160°, and because we know a line is 180°, angle a° is 20°. Same thing for the left side - our angles that are given (a right angle equaling 90°, and 75° which when added together give us 165°) we can then determine that c°=180-165. So, logically c°=15°. And following the aforementioned rule we can also determine d° is equivalent to 75°.
a°= 20°
b°= 160°
c°= 15°
d°= 75°