Question

In Fig. 16.176, Δ ABC is an equilateral triangle. Find m∠BEC.

Answer 1

In Fig. 16.176, ΔABC is an equilateral triangle. Find ∠BEC

• Since the quadrilateral ABEC is a cyclic quadrilateral, therefore the sum of the opposite angles of ABEC is supplementary.
• Supplementary angles are the pair of angles whose sum is = 180°  

• ∠BAC + ∠BEC = 180°
• ∠BEC = 180° - 60° = 120°

Hence ∠BEC = 120°

Answer 2

Answer:

Since, ΔABC is an equilateral triangles

Step-by-step explanation: