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.

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 ...

Ada explains the names of the different types of angle – acute ... Measurement and Geometry. Ada introduces Zach and Kayla to the concept of area, and different ways to measure and calculate ...