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I need help with this question-example-1

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Answer:

∠ABD = 20

Explanation:

BD is the angle bisector, ∠ABD = ∠CBD

∠ABD + ∠CBD = 40

∠ABD + ∠ABD = 40

2∠ABD = 40

∠ABD = 40/2

∠ABD = 20

User Harry Muscle
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