What's an example of contrapositive

A contrapositive is a statement that negates and interchanges the hypothesis and conclusion of a conditional statement.

Conditonal Statement:
If I go to work, the roads are clear.

Contrapositive (Of the conditional statement):
If the roads are not clear, I will not go to work

To form that contrapositive I negated both the hypothesis and conclusion, and then interchanged them.

This polygon has 4 sides
180(4-2) = 180(2) = 360 degree
80+90+2x + 3x = 360
170+5x = 360
5x = 190
x= 38
measure of angle t is 2(38)= 76
the answer is c. trust me
hope this !