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angle BCA is twice the size of angle ACD,
180/3 = 60 (angle ACD)
60 x 2 = 120 (angle BCA)
angle CBA = (180 – 120)/2 = 30

Ans : 30 degrees.

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Hope this answers your question.

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This is a Geometry question.

2u + 1u = 180

3u = 180

1u = 180 ÷ 3 = 60

BCA = 2u = 60 × 2 =120

180 – 120 = 60

60 ÷ 2 = 30

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