Write down each sum in order from the smallest to the largest number. ... If you build towers of 1, 5 and 3 pennies in the circles lining up on one side of the triangle, for example, ...

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.

Pythagorean Puzzle Here's the deal; there was this Greek guy named Pythagoras, who lived over 2,000 years ago during the sixth century B.C.E. Pythagoras spent a lot of time thinking about math ...

The sum of interior angles in a triangle is 180˚. In an equilateral triangle, all three angles are equal to 60˚. To find the missing angles in an equilateral triangle, divide the sum of interior ...