Find the area of triangle obc in terms of r and theta

How to determine whether two known pairs of points are on the same line.

Jordan rides his bike 6 7/15 miles every day to deliver newspapers and to go to and from school. if his ride to and from school is 4 3/10 miles, how many miles is the trip to deliver newspapers? 1 1/3 1 1/6 2 1/6 2 4/5

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem