Revise using the sine and cosine rules to find a side or angle in a triangle for National 5 Maths. National 5 Maths - Using the sine and cosine rules to find a side or angle in a triangle.
To calculate the area of a rectangle you multiply the length by the width. A right-angled triangle is like half a rectangle. So to calculate the area of a triangle, you can work out the area of the ...
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