in the figure, AB ll CD ll EF, find the value of (y + x) : (y - x)
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Step-by-step explanation:
<qpr+<prs=180°
50°+y=180° (sum of cointerior angles is 180°
and ab||CD with transversal pr)
y=130°
<rst+<rts+<str=180° (angle sum property of triangle)
rst=180°-110°=70°
rts=x
str=180°-130=50°
so, 70°+x+50°=180°
120°+x=180°
x=60°
x=60°
y=130°
y+x=130+60=190°
y-x=130-60=70°
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