Question

Please answer this step by step​

Answer 1

$according \: to \: therom \: 8$

angles on the center of the circle is double the angle in and at any segment of the circle.

so,

angle AOC=120degree.

angle aoc =2(angle BDC)

that implies=BDC=aoc÷2

120÷2=60

so,angle BDC=60degree.