Calculate the Missing Angle B in Triangle ABC: Given 105° and 45°

Note that from the diagram we are able to determine the value of angle BAC, since its corresponding angle is equal to 105.

Now in the triangle we are given two angles:

$BAC=105$

$BCA=45$

Since the sum of angles in a triangle is equal to 180, we can calculate angle ABC:

$180-105-45=30$