60 (number) geometry, it is the number of seconds in a minute, and the number of minutes in a degree. In normal space, the three interior angles of an equilateral triangle each measure 60 degrees, adding up to 180 degrees. Because it is divisible by the sum of its digits in base 10, it is a Harshad number. A number system with base 60 is called sexagesimal (the original meaning of "sexagesimal" is sixtieth). It is the smallest positive integer that is written with only the smallest and the largest digit of base 2 (binary), base 3 (ternary) and base 4 (quaternary).
Angle bisector theorem of the length of side "AB" to the length of side "AC": and conversely, if a point "D" on the side "BC" of triangle "ABC" divides "BC" in the same ratio as the sides "AB" and "AC", then "AD" is the angle bisector of angle "∠ A". The generalized angle bisector theorem states that if "D" lies on the line "BC", then Angles "∠ BAD" and "∠ DAC" are equal. Therefore, the right hand sides of equations () and () are equal, so their left hand sides must also be equal. which is the angle bisector theorem. If angles "∠