Given the base angles:
60 degrees
40 degrees
Let's solve for the measures of angles x and y.
Given that the sides are corresponding sides are congruent.
Using the mid-segment property:
x = 60°
By definition of corresponding angles.
Also, to solve for y, we have:
y = 180° - 40° = 140°
ANSWER:
x = 60°
y = 140°