Question

a = ________

Explanation:

Step1: Recall angle - sum property of a triangle

The sum of interior angles of a triangle is 180°.
Let the unknown angle be \(a\). Then \(a + 70^{\circ}+50^{\circ}=180^{\circ}\).

Step2: Solve for \(a\)

\(a=180^{\circ}-(70^{\circ} + 50^{\circ})\)
\(a = 180^{\circ}-120^{\circ}\)
\(a = 60^{\circ}\)

Answer:

\(60^{\circ}\)