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9x=180. x=180/9=20°.
(3x-5)+(2x+10)+y=180.
y=180-(55+50)=180- 105=75° x=20° y=75°
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9X =180
X = 20°
Y= 180 - (55+50)=75°
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9x = 180
X = 180 ÷ 9 = 20
A = 4 × 20 = 80
D = 3 × 20 = 60
B = 2 × 20 = 40
CDB = 20 × 3 _ 5 = 60 _ 5 =55
BcD =2 × 20 + 10 = 40 + 10 = 50
Y =180 _ ( 50 + 55 ) =
180 _ 105 =75
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معادلة١ ((3x-5)+(2x+10)+(y)=180
معادلة ٢ ((3x)+(4x)+(2x))=180
من٢ 9x=180
X=20°
نعوض x في معادلة ١
((3×20-5)+(2×20+10)+(y)=180
55+50+y=180
Y=180-105
Y=75°
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