For over a century, a simple yet tricky math problem had continued to baffle experts. Mathematicians struggled to find the fewest number of pieces needed to cut an equilateral triangle and ...

Image caption, The angles in the triangle you drew all add up to 180°. Remember, all angles on a straight line add up to 180°. The three angles in an equilateral triangle are equal and they add ...

The interior angles in a triangle always add up to 180º. An equilateral triangle has 3 sides of equal length. The dashes on the lines show they are equal in length. All of the angles are also equal.