Which is an example of a confitional statement?

Question

The angles of triangles add up to 180 degrees.
Vertical angles are always congruent
If two angles add up to 90 degrees, then they are complementary angles
Today is Tuesday if and only if yesterday was monday

Answer 1

An example of a conditional statement is:

If two angles add up to 90 degrees, then they are complementary angles.

This statement has the form "if P, then Q," where P is "two angles add up to 90 degrees" and Q is "they are complementary angles."