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misal o ....
bagi ruas oa:oc=3/3
sin =depan/miring
cari dulu tinggi titik o-B
ob=akar(7^2 - 3^2) =akar(49-9)=akar(40)= 2akar10
sin=
sehingga :
x = 5
r = 7
y = √7²-5²
= √49-25
= √24
= 2√6