As the numbers are known on the opposite and the hypotenuse, then we look for the ratio which uses both these sides (SOH CAH TOA). That ratio is the sine ratio. \(\sin (x^\circ ) = \frac{{opposite ...

If we then take a particular case, right-angle triangles, we can derive sine, cosine, and tangent functions (SOH, CAH, TOA). If we were to apply that to the triangle (and relax the right-angle ...

You can also use facts you know about other angles to classify triangles. This triangle has a right angle. We call this a right-angled triangle. It cannot be an equilateral triangle because that ...