A polygon has the same number of angles as sides. This means that if a polygon has 4 sides, it has 4 angles. In this particular problem, because the shape has 10 sides, it also has 10 angles
Answer:



Step-by-step explanation:
From the diagram, quadrilateral BCEF is a cyclic quadrilateral.
Opposite angles if a cyclic quadrilateral sum up to 180°

The diagonals intersect at D to form two pairs of vertical angles, and vertical angles are congruent.

Also sum of angles in triangle CBD is 180°.
