Q. 84.8( 9 Votes )

# <span lang="EN-US

(i)

ABC is equilateral triangle.

ABC = ACB = BAC = 60°____________________ (i)

BDC = BAC = 60°[Angles in the same segment of a circle are equal]

(ii)

ABCD is a cyclic quadrilateral

BAC + BEC = 180°

60° + BEC = 180°

BEC = 120°

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