The Elements were translated into both Latin and Arabic. It was superior to any work written prior to it. The printed copy came out in 1482. It was the geometry textbook by the 1700’s. Today it is considered one of the greatest works of all time.

To find out the total number of degrees in a polygon with N sides, all you have to do is to use the equation.

(N-2) ´ (180)

To find out the degrees in each angle if the polygon is regular (sides are the same length and the degrees in each angle is the same), you just use the formula above and divide by the number of sides the polygon.

1.) What are the total number of degrees in a rectangle?

90^O
180^O
360^O

2.) How many degrees are there in one angle of an equilateral (regular) triangle?

60^O
180^O
90^O

3.) How many degrees in all are there in a dodecagon (a twelve-sided polygon)?

1980^O
1800^O
2060^O