we have proven that if Angle 1 and Angle 2 are complementary, and Angle 2 and Angle 3 are complementary, then Angle 1 is equal to Angle 3.
Given:
Angle 1 and Angle 2 are complementary.
Angle 2 and Angle 3 are complementary.
Definition of complementary angles:
Angles are complementary if their sum is 90 degrees.
Apply the definition:
From 1, we know: ∠1 + ∠2 = 90°
From 1, we also know: ∠2 + ∠3 = 90°
Combining the equations:
(∠1 + ∠2) + ∠3 = 90° + 90°
Simplify the equation:
∠1 + ∠2 + ∠3 = 180°
We want to isolate ∠1 on one side.
Subtract ∠2 from both sides:
∠1 + ∠3 - ∠2 = 180° - ∠2
Apply the definition of complementary angles again:- Remember that ∠2 and ∠3 are complementary.
This means ∠2 + ∠3 = 90°
Substitute this into the equation:
∠1 + 90° - ∠2 = 180° - ∠2
Simplify:
Combine like terms:
∠1 + 90° = 180°
Subtract 90° from both sides:
∠1 = 180° - 90°
Simplify:
∠1 = 90°
Therefore, we have proven that if Angle 1 and Angle 2 are complementary, and Angle 2 and Angle 3 are complementary, then Angle 1 is equal to Angle 3.