Q.1. In quadrilateral ABCD,Angle D = 120. If Angle A = Angle B = Angle C Then Find Measures Of Angle A,B,C
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Step-by-step explanation:
sum of all angle of a quadrilateral=360°
D=120°
A=B=C
: =360°-120°
=240
240°is the sum of three angles so to find the one
A°+B°+C°=240
A=B=C
A+A+A=240
3A=240
A=240÷3
A=80
soo B=80&C=80.
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Answered by
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Step-by-step explanation:
Let the angle C be x
Then, the angle D be 2/3x
120°+ 90° + x+2/3x = 360°
210° + 3x + 2x/3 = 360°
210° + 5x/3= 360°
5x/3 = 360°-210°
5x/3= 150°
5x = 150°*3
x = 150°*3/5
x = 90°
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