A = kh - The area A of a triangle is proportional to its height h. , C = kw - The cost C of fish varies directly as its weight w in kilograms., D = ks - The distance D travelled by a car varies directly as its speed s., V = kh - The volume V of a cylinder varies directly as its height h. , F = kd - The fare F of a passenger varies directly as the distance d of his destination. , W = km - The Weight W of an object is direclty proportional to its mass m.,

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