In the figure below, find the value of x.
A 107°
B 112°
C 118°
D 135°
Explanation
📌 Step 1: Apply the Exterior Angle Theorem
An exterior angle of a triangle equals the sum of the two non-adjacent interior angles.
📌 Step 2: Set up the equation
x° = 45° + 73°
📌 Step 3: Solve
x = 118°
💡 Tip: The Exterior Angle Theorem is faster than finding the third interior angle first. Remember: exterior = sum of the two remote interior angles.