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=> 314 = 1/3 (3,14) . 5^2 . t
=> 314/3,14 = 1/3 . 25 . t
=> 100 = 25/3 . t
=> t = 100 . 3/25 = 12
garis pelukis : s = √(r^2 + t^2) = √(5^2 + 12^2) = √(25+144) = √169 = 13 cm