Triangles

By the end you’ll be able to

• Use the angle sum, isosceles and equilateral properties, and the side-angle relationship
• Apply the triangle inequality to find possible third-side lengths
• Apply the Pythagorean theorem, common triples and the 30-60-90 and 45-45-90 ratios
• Find areas using any base-height pair, and use similar-triangle ratios for lengths and areas