Core Mathematics - Right-angled triangles
This resource looks at right-angled triangles and the area of a triangle.
It includes information about the sine and cosine rules.
The right-angled triangle above shows the opposite side, the adjacent side
and the hypotenuse  of a triangle.
In any right-angled triangle, the trigonometric ratios can be defined as:
* Whenever you are dealing with a right-angled triangle, these are the
ratios you must use:
Find the value of _x,_ correct to two decimal places.
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