Warm Up. How’d the test go? Better? Worse? Did you do anything different to study for this test? How many times have you attended tutoring? Did you do every homework assignment for the unit?. Circular Trig. Basic Terms. An angle is formed by rotating a ray around its endpoint.
We don’t have to stop there!
(Add or subtract 360 as may times as needed to obtain an angle with measure greater than 0 but less than 360.)
a) 1115 b) 187
a) 1115° - 360° - 360° - 360° = 35°
b) 187 + 360 = 173
Think about what the word 360radian sounds like… it sounds like “radius,” right? It turns out that a radian has a close relationship to the radius of a circle.
(a) 30° (b) 120° (c) 60° (d) 270° (e) 104 °
Example 3: Convert each radian 360measure to degrees.
Write these down in your notes! If you memorize them, it will make converting from radians to degrees (and vice versa) much easier!