Long description: Trig6Fig7ab
Alt text: The image shows two diagrams illustrating angles on a circle: (a) an angle θ with radius r, and (b) an angle of 180 degrees.
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- The image contains two distinct diagrams, (a) and (b), both depicting angles centered at point O on a circle.
- Diagram (a) shows an angle θ formed by two radii, OA and OB, on a circle. The radius length is labeled as \(r\).
- Diagram (b) shows an angle spanning from point A to point B on a circle, with an arc drawn connecting the two points. The measure of this central angle is labeled as \(180^\text{o}\).