trig ratios.pptx - Spatial Thinking Trigonometric Ratios...

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Spatial Thinking Trigonometric Ratios
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Trigonometric ratios The term ‘trigonometry’ means relating to the geometry of triangles Pythagoras’ Rule is very useful in finding the lengths of unknown sides in right-angled triangles If we know the lengths of two of the sides, however sometimes we do not have this much information about side lengths. But we may know the size of some of the angles in the right-angled triangle If this is the case we can use what is known as trigonometric ratios to find the length of unknown sides
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Labelling the triangle When using trigonometric ratios we use a different way of naming the sides of the triangle Rather than using the a , b and c sides as we have done using Pythagoras’ Rule This is because when using trigonometric ratios we need to consider the information that is provided about the angles
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Labelling the triangle In this triangle there is one angle that has been identified and labelled
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