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What's on the worksheet
- For each angle, find the coterminal angle _0 inside one turn (0^ ≤ _0 < 360^, or 0 ≤ _0 < 2π for a radian angle), name its quadrant, and find its…−200°1,370°−845°-\dfrac{2\pi}{5}\dfrac{31\pi}{6}
- Let θ = -225^.
- Write each value as a trig value of its reference angle, with the right sign.
- Evaluate exactly.
- Elena finds (-240^) this way:
- Without a calculator, decide which value in each pair is larger.
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The free lesson teaches it with worked examples and practice problems.
Reference angles: the lesson ›More Chapter 3 worksheets: Angles, radians and the unit circle
- 3.1Sine, cosine and tangent
- 3.2Trig values of the special right triangles
- 3.3Angles in standard position and coterminal angles
- 3.4Radian measure
- 3.5Arc length and sector area in radians
- 3.6Angular and linear speed
- 3.7Trig functions on the unit circle
- 3.8Sine, cosine and tangent as functions of a real number
- 3.9Reference angles
- 3.10Signs of the trig functions by quadrant
- 3.11Secant, cosecant and cotangent ratios
- 3.12Secant, cosecant and cotangent on the unit circle
- 3.13Exact values on the unit circle
- 3.14Unit circle symmetry and even-odd identities
- 3.15Periodicity and the periodicity identities