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