## 6.4 Calculating in right-angled triangles

Now we also can calculate with sine and cosine in right-angled triangles. In paragraph 6.2 we already practised calculating with the tangent. We just have to know when we use which trigometric ratio we have to use in certain situations.

SOHCAHTOA is very useful in these exercises. The following worksheet is to practise calculating in right-angled triangles.

Solving right triangles

In a triangle without right angles, you first have to draw an auxiliary line to make a right angle. Often, you can calculate the length of a side or the size of an angle using the sine, cosine or tangent. You can practise this in the next exercises.

trig_multi_step.pdf