A stone is dropped into a lake, creating a circular ripple that travels outward at a speed of $45 \mathrm {~cm} / \mathrm { s }$. 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 $45 \mathrm {~cm} / \mathrm { s }$. 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 45 cm/s45 \mathrm {~cm} / \mathrm { s }45 cm/s

A Stone Is Dropped into a Lake, Creating a Circular $45 \mathrm {~cm} / \mathrm { s }$