What type of interval is in the green sections?

In the diagram below what is the approximate length of the minor arc ab

Which is the most efficient first step to solve x in the equation 3.7x - 18 = -4.3x -34 a. add 3.7x to both sides of the equation. b. add 4.3x to both sides of the equation. c. subtract 18 from both sides of the equation. d. subtract 34 from both sides of the equation.

The measure of an angle is 117°. what is the measure of a supplementary angle?