Question

1. find the measure of angle r.

80
140
40
220

Explanation:

Step1: Find the minor arc measure

The total circle is $360^\circ$, so minor arc = $360^\circ - 220^\circ = 140^\circ$.

Step2: Calculate angle R

Angle R is half the difference of arcs: $\frac{1}{2}(220^\circ - 140^\circ) = 40^\circ$.

Answer:

40