What is the answer here? I don't know and I've guessed and failed once already.

In the figure, triangle aob and triangle boc form a linear pair ,find the measure of x

Asprinkler sprays over a distance of 40 feet and rotates through an angle of 80. find the area watered by the sprinkler.

Triangle abc and triangle deg are similar right triangles. which proportion can be used to show that the slope of ac is equal to the slope of dg? a) 4 − (−7) / 0 − 4 = −1 − 10 / 4 − 8b) −4 − (−7) / 0 − 4= 4 − 8 / −1 − (−10)c) 0 − 4 / −4 − (−7) = −1 − (−10) / −4 − 8d) 0 − 4 / −4 − (−7) = −4 − 8 / −1 − (−10)