ࡱ> (*'T@  jbjbqq < l22222$VL2$>>>>< , ???I>>III? >>I?II%M 722Iem,IIMATH 116 ACTIVITY 3: Area between curves and the definite integral WHY: Area between curves gives a nice practice application of the definite integral (some setup, but not too complex) but also serves as a model of the total effect of a difference over time total change in a population will be the difference between the effect of birth rate and death rate, for example [so that total change would be represented by the area between the birth curve and the death curve ) LEARNING OBJECTIVES: 1. Further understanding of the integral as a summing mechanism (adding up area) 2. Be able to set up the integrals necessary for calculation of areas. 3. Be able to calculate integrals using the fundamental theorem of calculus or approximate with a sum (as appropriate) CRITERIA: 1. Success in completing the exercises. 2. Success in working as a team and in filling the team roles. RESOURCES: 1. Your text - especially section 7.6 2. Your class notes from the last two days 3. The team role desk markers (handed out in class for use during the semester) 4. 40 minutes PLAN: 1. Select roles, if you have not already done so, and decide how you will carry out steps 2 and 3 2. Read through the model and complete the exercises given here - be sure all members of the team understand and agree with all the results in the recorder's report. 3. Assess the team's work and roles performances and prepare the Reflector's and Recorder's reports including team grade . MODEL: We can use the definite integral to calculate the area between two graphs in much the same way we use it to calculate the area under the graph of a positive function. As before, this gives a representation of the total change - but this time we allow for two rates of change interacting. We still want to multiply the base by height to get area but this time the height depends on two graphs (one at the bottom of the area, one at the top) rather than just one. the rule is that the area between two graphs, from x = a to x = b, is given by  EMBED Equation.3  - if we set up rectangles for approximation, the base for each is (x and the height is (top bottom). If the graphs do not cross, this is straightforward we use  EMBED Equation.3  If the graphs cross, then the formula for y(top) sometimes comes from one function, sometimes from the other, and we have to split up the integral using the  EMBED Equation.3  property of the definite integral. Usually we need to sketch the graphs (take advantage of our calculator] to see whether the graphs cross and which graph is on top where. Example 1: Area between the graphs of  EMBED Equation.3  and  EMBED Equation.3  between x = 0 and x = 2.  Looking at the graphs, we see that the graph of f2 is above the graph of f1 (f2(x) is larger than f1(x) ) for all x values between 0 and 2, so y(top) is f2(x) and y(bottom) is f1(x) . this tells us area =  EMBED Equation.3  EMBED Equation.3  Example 2: Area between the graphs of  EMBED Equation.3  and  EMBED Equation.3  between x = -1 and x = 2.  Looking at the graphs, we see that these graphs cross twice between x = 1 and x = 2 solving the equation  EMBED Equation.3  [that is,  EMBED Equation.3 ] tells us they cross at x = 0 and at x = 1. For x < 0, the graph of  EMBED Equation.3  is on top; from x = 0 to x = 1, it is that is on top, and for x > 1,  EMBED Equation.3  is again on top. We split up the integral so that we can write  EMBED Equation.3  (and know what formula is top and which is bottom) and get Area =  EMBED Equation.3  EMBED Equation.3  EMBED Equation.3  =  EMBED Equation.3  EXERCISES: [I suggest using a calculator to sketch graphs of these, before diving into calculations] 1. Find the area bounded by the graphs of  EMBED Equation.3  and  EMBED Equation.3  from x = 0 to x = 4 Make sure you show the integral (or integrals) involved here. 2. Give the area (its in two pieces) bounded by the graphs of  EMBED Equation.3  and  EMBED Equation.3  from x = 0 to x = 5 3 This table gives a set of values for two functions f and g at various values of x. Use the midpoint approximation, with n = 5, to approximate the area between the graphs from x = 2.0 to x = 3.0 [there is enough information here in fact, theres more than you need -- to calculate this approximation). What is x? what are the subintervals? What are the midpoints? What is the value of (top bottom) at the midpoints? x2.02.12.32.52.72.93.0f(x)5.15.35.44.94.23.83.6g(x)3.23.33.64.54.64.84.9 CRITICAL THINKING QUESTIONS:(answer individually in your journal) 1. Why does the integral correspond almost to area? Why doesnt the integral always give area correctly? 2. Does it seem to you that the integral is a more complicated idea than the derivative? Why? Or why might people think so? 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