Please solve it and answer is 360°
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Answer:
360°
Step-by-step explanation:
In the whole answer "/" means angle symbol.
/ABD + /DBC + /BCD + /CDB + /BDA + /DAB=360°
(/ABD+/BDA+/DAB) + (/DBC+/BCD+/CDB)=360°
ΔABD + ΔDBC=360°
ΔABD=180° [i] (Angle Sum Property of Triangle
ΔDBC=180° [ii] (Angle Sum Property of Triangle
Adding [i] and [ii]
180+180=360
ΔABD + ΔDBC=360°
So all angles of quadrilateral ABCD add to make 360°
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