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22. 80°/48=RS/18
= rs= 18×80/48 =30°
23.5x+2x+sudutQ=180°
5x=90 , x = 18
= 90+2(18)+Q=180
= 90+36+Q =180
=Q= 180-90-36
=54°
24. 78 : 2 = 39°