please answer my question correctly please please please please please please
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Let the w
quad be ABCD. Draw diagonal BD
Consider ∆ABD
angle A + angle ABD + angle ADB = 180..... (1)
Consider ∆ BDC
angle C + angle CBD + angle CDB = 180....(2)
Add (1) + (2)
angle A + angle C + (angle ABD + angle CBD) + (, angle ADB+ angle CDB) = 180 + 180
angle A + angle C + angle B + angle D = 360=4 right angle
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