By our very goofy system the circle constant denotes half a circle,
. So the conversion factor from radians to degrees is
Calling the rightmost dot [1] and counting counterclockwise, that's dot [4].
That's dot [6]
That's dot [12]
That's dot [14]
Answer:
Let a and b integers and suppose that are even numbers. Then, exist integers k and m such that and
.
Then,
Since, k and m are integers then n=k+m is an integer. Then, since a + b is of the form 2 by an integer n, then a + b is an even number.