How should the following statement be written in if - then form?

The sum of the measures of the angles of a triangle is 180 degrees.

If the sum of the measures of the angles is 180 degrees, then there exists a triangle.
If a triangle exists, then the sum of the measures of the angles is 180 degrees.
If two rays are opposite, then they form a straight line.

Question

How should the following statement be written in if - then form?

The sum of the measures of the angles of a triangle is 180 degrees.


If the sum of the measures of the angles is 180 degrees, then there exists a triangle.
If a triangle exists, then the sum of the measures of the angles is 180 degrees.
If two rays are opposite, then they form a straight line.

anonymous · Answer

i'd say this one:  "If a triangle exists, then the sum of the measures of the angles is 180 degrees."