Area between curves AP Calculus Mrs. Mongold Gateway Arch, St. Louis, Missouri.

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Presentation transcript:

Area between curves AP Calculus Mrs. Mongold Gateway Arch, St. Louis, Missouri

How can we find the area between these two curves? We could split the area into several sections, use subtraction and figure it out, but there is an easier way.

Consider a very thin vertical strip. The length of the strip is: or Since the width of the strip is a very small change in x, we could call it dx.

Since the strip is a long thin rectangle, the area of the strip is: If we add all the strips, we get:

The formula for the area between curves is: We will use this so much, that you won’t need to “memorize” the formula!

Find the area of the region bounded by:

If we try vertical strips, we have to integrate in two parts: We can find the same area using a horizontal strip. Since the width of the strip is dy, we find the length of the strip by solving for x in terms of y.

We can find the same area using a horizontal strip. Since the width of the strip is dy, we find the length of the strip by solving for x in terms of y. length of strip width of strip

Find the area of the region bounded by:

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