Answer:
what school do you go to because i think we go to the same one
Step-by-step explanation:
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y = 50°
The main diagonal BD is the perpendicular bisector of AC
The main diagonal BD bisects ∠ABC
∠ABD = 180° - (90 + 40)° = 180° - 130° = 50°
∠ABD = ∠CBD
Hence y ∠CBD = y = 50°
Answer is BD
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