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2/3 besar sudut b + 3/3 besar sudut b=180
5/3 besar sudut b=180
besar sudut b=180:5/3=108
besar sudut a=72
4b. besar sudut b + a=90
5/3 besar sudut b=90
besar sudut b=90:5/3=54
besar sudut a=54-36=18
selisih:54-36=18