Question

which equation can be used to find the value of x?
$x + 45 + 40 = 360$
$x + 45 + 40 = 180$
$x = 45 - 40$
$x = 45 + 40$

Explanation:

Step1: Recall Triangle Angle Sum

The sum of the interior angles of a triangle is \(180^\circ\). Here, the angles are \(x^\circ\), \(45^\circ\), and \(40^\circ\).

Step2: Formulate the Equation

So the equation should be \(x + 45 + 40 = 180\) as it represents the sum of the triangle's interior angles.

Answer:

\(x + 45 + 40 = 180\) (the second option)