Mathematics is really my short board subject! All kinds of immortals help me 8! Second grade knowledge! It's not difficult! - Training Enrollment Network

Mathematics is really my short board subject! All kinds of immortals help me 8! Second grade knowledge! It's not difficult!

Because AB=AD, △ABD is an isosceles triangle, ∠ ADB = (180-∠ bad) ÷ 2,

Similarly, because AC=AD, △ACD is an isosceles triangle, ∠ ADC = (180-∠ CAD) ∠ 2,

So ∠ BDC = ∠ ADC-∠ ADB = (180-∠ CAD) ∠ 2-(180-∠ bad) ∠ 2 = (∠.

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