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Finding Angles

Using the inverse ratios.
by

Andrew Lanning

on 27 April 2010

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Transcript of Finding Angles

Finding Angles But first... Calculate the length of k. Now we're going backwards to
calculate the angle! When we know the ratio between 2 sides,
we can work out the angle. -1 Instead of using sin, cos, or tan,
we use sin , cos , or tan

They are called the inverse functions.
ie: "inverse sine"

Here's how to use them... Calculate the angle 'a' a 14cm 10cm Practice:
Ex 4.4, page 147
Q1 (just do inverese
Q4 (a,c,e)
Q6, 7, 8, 11 -1 -1
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