# A = l *w is a formula relating area of a rectangle to its height and width. Write an equation relating (DA/dt) to (dl/dt) and (dw/dt)?

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#### Explanation

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#### Explanation:

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Mar 8, 2018

$\frac{\mathrm{dA}}{\mathrm{dt}}$=$\left[w\right] \frac{\mathrm{dl}}{\mathrm{dt}}$+$\left[l\right] \frac{\mathrm{dw}}{\mathrm{dt}}$.

#### Explanation:

Area =$l \cdot$w, so differentiating this , implicitly with respect to t ,gives the above equation.

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