Question: Triangle ABC is a right triangle with angle B = 90 degrees. Angle A is 30 degrees. A line is drawn from a point D

Triangle ABC is a right triangle with angle B = 90 degrees. Angle A is 30 degrees. A line is drawn from a point D on line AB to C such that angle CDB is 60 degrees. The length of segment AD is 20. Find the length of side BC. Explain your answer by showing your work. The answer is 103.

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