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jd, <COD + <COB + <BOA =180
=> (2x+10) +90 + (3x) = 180
=>2x +10 +3x =180-90
=>5x+10 = 90
=>5x = 80
x = 16
<DOC= 42
<BOA = 48
sudut yg besarny 2/3 dr penyiuku adalah 60
crny:
2/3 . 90 = 60
niali x adalah 90, dgn cr mncri sudut2 yg berseberangan, susah deq kalo dijelasin, tp cr aja lewat gmbar, cr pelan2 nnti dpt hsilnya 90 derajat