How to find the area of a triangle if you don't have the height: How to use Hero/Heron's formula. Скачать
What is the difference between a quadrilateral, trapezoid, parallelogram, rectangle and square? Скачать
Factoring 4: How to factor with negative numbers when factoring a quadratic (another example) Скачать
Calculus math notation: The difference between delta x and h in the limit definition of a derivative Скачать
