Question

complete the proof that ( mangle rsx + mangle qvu = 180^{circ} ).

Explanation:

Step1: Substitute angles

Since \( \angle RSX\cong\angle EFX\) (from step 3), we can substitute \( \angle EFX\) with \( \angle RSX\) in the equation \(m\angle EFX + m\angle QVU=180^{\circ}\) (from step 4).

Answer:

\(m\angle RSX + m\angle QVU = 180^{\circ}\) (by substitution property of equality)