vertex, angle of a quadrilateral
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Answer:
Sum of angle of quadrilateral ===. 360°
Step-by-step explanation:
angle A. =. 60°
angleB. =. 60°
angleC. =. 60°
angleD. = 60°
therefore, Sum of angle of quadrilateral. =. 60°+60°.
. + 60°+60°
= 360°
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