Question

the movement of the progress bar may be uneven because questions can be worth more or less (including zero) depending on your answer.
find the measure of angle $angle aef$ in the figure below. enter only the number.
the solution is

Explanation:

Step1: Identify straight angle property

$\angle DEB = 180^\circ$ (straight angle)

Step2: Calculate $\angle DEF$

$\angle DEF = 180^\circ - 120^\circ = 60^\circ$

Step3: Identify vertical angle equality

$\angle AEF = \angle DEF$ (vertical angles are equal)

Answer:

60