1.

SAFig, 6.14

Answer»

let angle a and b be 2x and 3xa+b+90=180 (linear angles)2x+3x+90=1805x=180-905x=90x=90/5x=18angle a=2x=2×18=36angle b=3x=3×18=54MON is a line sob+c=180 (linear pair)54+c=180c=180-54c=126



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