Since you have two angles that measure 45 degrees. Those 2 equal 90 degrees altogether. Since a triangle measures 180 degrees, you take 180-90 because you already have 2 angles and are trying to find the last one. Then this makes the last angle 90 degrees.
It is called a consistent dependent system
Answer:
Step-by-step explanation:
The resultant can be calculated using triangular law of vector addition as :