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FIND AN UNKNOWN SIDE LENGTH
Did you know?
Study using trig ratios to find the length of a side
This page from mathsisfun.com explains how to choose which trig ratio (sine, cosine or tangent) to use when you need to find the length of a side. There is also a set of interactive practice problems at the bottom of the page.
A right triangle can have its right angle at the top.
Study and practice
Use these search terms to find your own resources:
solving right triangles with trigonometry
solving right triangles with sines, cosines and tangents