Question

Find m∠DOB. A) 36.5° B) 73° C) 107° Eliminate D) 136°

Answer 1

The solution is 73°. According to one of the circle theorems, the angle formed by the intersecting chords is equal to the average of the arcs intercepted by the angle and its vertical angle.

`(170 + 44)/(2)` = 107°

So m∠DOC = 107°

Since m∠DOB is supplementary to m∠>DOC we know that its measure is 73°.

Answer 2

The Answer is B. 73, just checked it