Respuesta :
Steps to find missing angles.
Step 1: Add together the known angles.
Step 2: Subtract the sum from 180°.
Step 1: Add together the known angles.
Step 2: Subtract the sum from 180°.
As Tashif said,
You add the known angles but then you subtract your answer by 180 degrees.
You add the known angles but then you subtract your answer by 180 degrees.
