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G S Rehill's Interactive Maths Software Series - "Building a Strong Foundation in Mathematics" from mathsteacher.com.au.

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Year 10 Interactive Maths - Second Edition


Finding Side-Lengths

We can use the trigonometric ratios sine, cosine and tangent to find any side-length of a right-angled triangle if we know another angle and one side-length.


Using the Sine Ratio

Example 3

Find the value of the pronumeral, correct to 2 decimal places, in the given diagram.

Solution:


Example 4

Find the length of the hypotenuse, correct to 2 decimal places, in the given diagram.         

Solution:
Let the length of the hypotenuse be x cm.

So, the length of the hypotenuse is 55.01 cm.

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