Textbook Question
Area Find (i) the net area and (ii) the area of the following regions. Graph the function and indicate the region in question.
The region bounded by y = 6 cos π and the π-axis between π = βΟ/2 and π = Ο
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9. Graphical Applications of Integrals
Area Between Curves
3:45 minutesProblem 5.R.87
Textbook Question
Area of regions Compute the area of the region bounded by the graph of Ζ and the π-axis on the given interval. You may find it useful to sketch the region.
Ζ(π) = 16βπΒ² on [β4, 4]
Verified step by step guidance1
Step 1: Understand the problem. We are tasked with finding the area of the region bounded by the graph of the function Ζ(π) = 16 - πΒ² and the π-axis over the interval [β4, 4]. This involves integrating the function over the given interval.
Step 2: Set up the definite integral. The area under the curve is given by the integral of Ζ(π) from β4 to 4. The integral can be written as: β«[β4, 4] (16 - πΒ²) dπ.
Step 3: Break down the integral. Split the integral into two parts for easier computation: β«[β4, 4] 16 dπ - β«[β4, 4] πΒ² dπ. This allows us to handle each term separately.
Step 4: Compute the antiderivatives. The antiderivative of 16 is 16π, and the antiderivative of πΒ² is (πΒ³)/3. Substitute these into the integral: [16π] from β4 to 4 - [(πΒ³)/3] from β4 to 4.
Step 5: Evaluate the definite integrals. Substitute the limits of integration (π = 4 and π = β4) into the antiderivatives and compute the difference for each term. Add the results to find the total area. Remember, if any part of the integral evaluates to a negative value, take its absolute value since area is always positive.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Definite Integral
The definite integral of a function over a specific interval represents the net area between the graph of the function and the x-axis. It is calculated using the Fundamental Theorem of Calculus, which connects differentiation and integration. The integral can yield positive, negative, or zero values depending on whether the function is above or below the x-axis within the interval.
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Area Under a Curve
The area under a curve can be interpreted as the accumulation of values of the function over a given interval. When calculating the area bounded by the curve and the x-axis, it is essential to consider the sign of the function; areas below the x-axis are subtracted from the total area. This concept is crucial for understanding how to compute the total area of regions defined by the function.
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Sketching the Region
Sketching the region bounded by the graph of a function and the x-axis helps visualize the area to be calculated. It allows for a better understanding of where the function is positive or negative, which influences the area calculation. A sketch can also reveal important features such as intersections with the x-axis, which are critical for determining the limits of integration.
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