40
80 degrees.
20 degrees and the two equal angles will be 80 degrees each
107 because the overall sum of exterior angles add up to 360
If your "53" is in degrees, then the vertex angle is 74 degrees.
It is an isosceles triangle
80 degrees.
135 degrees.
63
In any triangle exterior angle plus interior angles = 180 degrees
(180 - 38)/2 = 71 degrees (base angles of an isosceles triangle are congruent).
An Isosceles Triangle
yes
57.5 degrees
20 degrees
exterior angle theorem
105 degrees
84 degrees