Angles of any triangle add up to 180 degrees.
\(180^{\circ} = 60^{\circ} + 60^{\circ} + x \)What is the missing angle of a triangle, if the other two are \(60\deg\)?
\(180^{\circ} = 120^{\circ} + x\)
\(180^{\circ} - 120^{\circ} = 120^{\circ} - 120^{\circ} + x\)
\(60^{\circ} = x\)
