in a quadrilateral angle(A+C)=2angle(B+D) if angle(A)=40, find angle(B)

this question is considered with quadrilaterals

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1 Answer

quadralateral...4 sides

sum av 4 angels=360 deg

angel a=40 deg

angel a +angel c=2*(angels B+D)

this meen (b+d)=360/3=120 deg & a+c=240 deg

so c=240-40=200 deg

b+d=120 deg...selekt NE thang yu want for b & then get d

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