MathCat Math Hacks - Math Secrets Math Tricks Free Math Tutorials - algebra lessons and mathematics homework. Mathematics examples and math lessons worked out. How to make a pi plate. Pi is the ratio of the diameter of a circle to the circumference of a circle. • How to Remember the Unit Circle - How to M... . How to find the area of a triangle. How to find the perimeter of a triangle. • How to Find the Tangent Given the Lengths ...