Question

which equation can be used to find the value of x?
x + 68 + 72 = 360
x = 72 - 68
x = 68 + 72
x + 68 + 72 = 180
(there is a triangle with angles 68°, 72° and x°)

Explanation:

Step1: Recall Triangle Angle Sum

The sum of interior angles in a triangle is \(180^\circ\).

Step2: Apply to the Triangle

The triangle has angles \(x^\circ\), \(68^\circ\), and \(72^\circ\). So, \(x + 68 + 72 = 180\).

Answer:

\(x + 68 + 72 = 180\) (the last option)