These Trigonometry lessons are a good way to introduce a topic or to reinforce more extensive classroom instruction and assessment. For example, the lessons about unit circles and angle addition formulas are particularly thorough. After each lesson, have students complete the practice problems -- they'll have the option to access hints and additional supporting videos. When used with the new missions interface, the lessons themselves take a back seat to Khan's individualized learning approach, which is great for kids at this level. Trigonometry is a visual topic, so kids should work with this module individually -- challenge them to complete the practice problems on their own. However, bring the class back together to discuss possible solutions -- encourage open reflection on the strategies and skills they used to solve any particularly challenging problems.
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Key Standards Supported
Understand radian measure of an angle as the length of the arc on the unit circle subtended by the angle.
(+) Use special triangles to determine geometrically the values of sine, cosine, tangent for π/3, π/4 and π/6, and use the unit circle to express the values of sine, cosine, and tangent for π–x, π+x, and 2π–x in terms of their values for x, where x is any real number.
Choose trigonometric functions to model periodic phenomena with specified amplitude, frequency, and midline.
Prove the Pythagorean identity sin2(θ) + cos2(θ) = 1 and use it to calculate trigonometric ratios.
(+) Prove the addition and subtraction formulas for sine, cosine, and tangent and use them to solve problems.
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