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How to Find the Missing Angle in a Triangle Using Vertical Angles Step 1: Find the measure of the angle across from the missing angle. Step 2: The missing angle is equal to the angle across from it. Step 1: Find the measure of the angle across from the missing angle. Step 2: The missing angle is equal to the angle across from it. Angle 1= 25º Angle across from x = 180 – 25 – 90 Angle across from x = 155 – 90 Angle across from x = 65° Angle 2= 90º x = 65° Angle x = ? Angle across from x = 180 – Angle 1 – Angle 2

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