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- G20b – Trigonometric ratios – sin, cos and tan
- G20c – Inverse trigonometric functions
- G22a – The sine rule – knowledge of the convention to label sides and opposite angles a, b,c, and A, B and C respectively is required for this whole lesson, and knowledge of the sine rule itself is required for the Gamma exercise
- G22b – The cosine rule – knowledge of the cosine rule is required for the Gamma exercise
Area of a triangle using sine
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- Worksheet (with space for student work)
- Handout (slides with exercises only; 4 per page for reduced printing)
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Activity: areas of regular polygons and limits
This applet shows you a regular polygon. Drag the slider to change its number of sides. No matter how many sides it has, the distance from its centre to each vertex is fixed at 1 cm. What do you notice about the area of the polygon as you increase the number of sides it has?