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

Question

In Fig. 16.176, &#x394; ABC is an equilateral triangle. Find m &#x2220; BEC.

Philoid · Accepted Answer

Since,

Triangle ABC is an equilateral triangle

∠BAC = 60^o

∠BAC + ∠BEC = 180^o (Opposite angles of quadrilateral)

60^o + ∠BEC = 180^o

∠BEC = 120^o