Question

identify the reasons that justify the following statement. \if l ⊥ m, then ∠1 is a right - angle\

1. definition of a right angle
2. angle addition postulate
3. definition of complementary angles
4. definition of perpendicular

Explanation:

When two lines are perpendicular, the angles formed between them are right - angles. By the definition of perpendicular lines, if \(l\perp m\), the angle between them (\(\angle1\)) is a right - angle.

Answer:

Definition of perpendicular