The document discusses different types of triangles and their angle and side properties: 1) It explains 45-45-90 triangles, also known as isosceles right triangles, have two equal leg lengths and a hypotenuse that is √2 times the length of either leg. 2) It discusses 30-60-90 triangles, which have angles of 30, 60, and 90 degrees. The hypotenuse of each triangle is twice the length of the shorter leg, and the longer leg is √3 times the length of the shorter leg. 3) Various properties of special right triangles like the Pythagorean theorem and multiplying square roots are presented to calculate side lengths from angles or other