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Review Problem – Riemann Sums Use a right Riemann Sum with 3 subintervals to approximate the definite integral:

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Applications of the Definite Integral Mr. Reed AP Calculus AB

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Finding Areas Bounded by Curves To get the physical area bounded by 2 curves: 1.Graph curves & find intersection points – limits of integration 2.Identify “top” curve & “bottom” curve OR “right-most” curve & “left-most” curve 3.Draw a representative rectangle 4.Set up integrand: Top – Bottom Right – Left

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Finding Intersection Points Set equations equal to each other and solve algebraically Graph both equations and numerically find intersection points

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Example #1 Find the area of the region between y = sec 2 x and y = sinx from x = 0 to x = pi/4.

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Example #2 Find the area that is bounded between the horizontal line y = 1 and the curve y = cos 2 x between x = 0 and x = pi.

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Example #3 From Text – p.240 - #16

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Example #4 Find the area of the region R in the first quadrant that is bounded above by y = sqrt(x) and below by the x-axis and the line y = x – 2.

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Summarize the process

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AP MC Area Problem #12 from College Board Course Description

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Homework P.236-240: Q1-Q10, 13-25(odd)

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Authentic Applications for the Definite Integral Example #2 – p.237

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Definite Integral Applied to Volume 2 general types of problems: 1.Volume by revolution 2.Volumes by base

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Volume by Revolution – Disk Method The region under the graph of y = sqrt(x) from x = 0 to x = 2 is rotated about the x-axis to form a solid. Find its volume.

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Volume by Revolution – Disk Method

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Homework #1 – Disk Method about x and y axis P.246-247: Q1-Q10,1,3,5

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Volume by Revolution – About another axis The region bounded by y = 2 – x^2 and y = 1 is rotated about the line y = 1. Find the volume of the resulting solid.

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Volume by Revolution – Washer Method Find the volume of the solid formed by revolving the region bounded by the graphs of f(x) = sqrt(x) and g(x) = 0.5x about the x-axis.

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Homework #2 – Washer Method & Different axis P.247 – 249: 7,9,11,14

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Volume with known base The base of a solid is given by x^2 + y^2 = 4. Each slice of the solid perpendicular to the x- axis is a square. Find the volume of the solid.

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Homework #3 – Different axis & known base P.249: 15,16,18,19

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5/16/2015 Perkins AP Calculus AB Day 5 Section 4.2.

5/16/2015 Perkins AP Calculus AB Day 5 Section 4.2.

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