A stone is dropped into a lake, creating a circular ripple that travels outward at a speed of 45 cm/s. Express the radius r of this circle as a function of the time t (in seconds) and find $A \circ r$ if A is the area of this circle as a function of the radius.

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The Answer of A stone is dropped into a lake, creating a circular ripple that travels outward at a speed of 45 cm/s. Express the radius r of this circle as a function of the time t (in seconds) and find $A \circ r$ if A is the area of this circle as a function of the radius.

A Stone Is Dropped into a Lake, Creating a Circular A∘rA \circ rA∘r

A Stone Is Dropped into a Lake, Creating a Circular $A \circ r$