Question

Which of the following is a theorem ?

• A. Sum of the angles of a triangle is 180°
• B. Sum of the angles of a leniear pair is 180°
• C. If equal angles are subtracted from equals, then the remaining are the same.
• D. There can be one and only one straight line joining two points.

Answer 1

Answer:

A. Sum of the angles of a triangle is 180°

Sum of the angles of a triangle is 180° is a theorem.