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3 years ago

How to do? Can anyone help me please? I will appreciate that a lot!

Mathematics

1 answer:

Nitella [24]3 years ago

4 0

Triangle ABD is inscribed in circle and has hypotenuse as circle's diameter so angle ABD must be 90°

Since it is parallelogram, ∠ABD = ∠BDC = 90° and it is given that ∠ADB = 30°

So we have ∠CDO = ∠CDB + ∠ADB = 30° + 90° = 120°

Final answers: ∠CDO = 120° and ∠ABD = 90°

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