Coaching Centre
Chapter 7: Trigonometry Notes
Exact values, trigonometric ratios of obtuse angles, the sine rule, the cosine rule, the area of a triangle, the four quadrants and graphs of sine, cosine and tangent.
Sections
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7A Exact values and obtuse angles Mastered
Exact trigonometric values for 30°, 45° and 60° from special triangles, and sine, cosine and tangent of obtuse angles.
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7B The sine rule Mastered
The sine rule for any triangle, finding unknown sides and angles, and the ambiguous case.
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7C The cosine rule Mastered
The cosine rule for finding a side from two sides and the included angle, and finding an angle from three sides.
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7D Area of a triangle Mastered
The formula Area = ½ab sin C for any triangle given two sides and the included angle, and finding an unknown side or angle from the area.
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7E The unit circle and trigonometric graphs Mastered
Defining sine and cosine on the unit circle, signs in the four quadrants, related angles, and the graphs of y = sin x, y = cos x and y = tan x.