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olganol [36]
3 years ago
11

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 i<span>nscribed in circle and </span>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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