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Answer:The sum of all angle of quadrilateral is 360°.
Step-by-step explanation:Hence,x°+x°+1/2x°+1/2x°=360°
=6x°/2=360°
=6x°=360°×2
=6x°=720°
=x°=720°/6
=x°=120°
Hence,x°=120°
x°=120°
1/2x°=60°
1/2x°=60°
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