This is a look at using the trig area rule (1/2 absinC) to find the area of a triangle in various contexts. It comes with an excellent worksheet that has different problems. The worksheet also looks to model the harder possible exam style questions.
The lesson also comes with a starter, lesson objectives, clear teaching slides, how to derive the formula, a worksheet with answers and a plenary. 12 slides.
This is a part of an excellent series/bundle on different areas of Trigonometry that is available at a discount and is highly recommended as a series.
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