Similar Triangles and Sine, Cosine, Tangent.

• Identify similar shapes

• Use Sin, Cos and Tan for acute angles

Similarity

Two shapes are Similar if the only difference is size (and possibly the need to turn or flip one around). Information on similar triangles.

See if you can figure out how tall a tree is without having to measure its height:

Right angled triangle ratios

Sine, Cosine and Tangent ratios

Remember:

Sohcahtoa

Soh...	Sine = Opposite / Hypotenuse
...cah...	Cosine = Adjacent / Hypotenuse
...toa	Tangent = Opposite / Adjacent

Click the image below for some extra exercises and further information:

Homework:

P289 Ex1 Q. 6, 11, 13, 16, 17

P293 Ex 2 Q. 17-20

P293 Ex 3 Q. 4, 6, 7, 10, 11, 12