Know the trigonometry ratios for 0°, 30°, 45°, 60° and 90°
Use an equilateral triangle and an isosceles triangle to work out the exact values for trigonometry ratios for 0°, 30°,45°,60° and 90°
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Lesson summary: Know the trigonometry ratios for 0°, 30°, 45°, 60° and 90°
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The next lesson in Trigonometry 3 is "Substitute the exact values to find a missing length"