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jadi
90 / 135 = juring aoc / 57
135 juring aoc = 90 . 57
135 AOC = 5130
AOC = 5130 / 135
= 38 cm2
<AOC=90'
<AOB+<BOC=270' BOC=270/2=135
derajatt luas juring
135' 57cm
90' x
(dikali silang)
3x=114
x=114/3=38