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p=11/3l
Keliling=2(p+l)
K=2(11l/3+l)
K=11l+3l
-- --------
2 3
280=14l
------ ---- (dikali silang)
2 3
3x280=2x14l
3x280=28l
3x10=l
l=30
p=11l/3
p=11x30/3
p=110
L=pxl
L=110x30
L=3300