Discover the different types of angles and how to make sure you get the biggest slice of pizza. Horizontal and vertical lines Learn how to identify different types of lines, including vertical ...

Discusses the properties and types of triangles, explaining that a triangle is a closed figure with three sides and angles. It categorizes triangles into equilateral, isosceles, scalene ...

It's possible to demonstrate and prove mathematically that the angle sum of every triangle is 180 degrees. The techniques used are useful for solving all kinds of other geometry problems too.