Question

In triangle DEF, line DE is congruent with line FD and the measurement of angle F is 55. Find the measurement of angle E. (isosceles triangle)

Answer 1

Explanation:

because it is an isoceles triangle (both legs are equally long), E and F are the side angles in the baseline.

and because both leg sides are equally long, also both side angles must be equally large

therefore,

angle E = angle F = 55°.