1081 Concurrent Events: An Exploration of the Points of Concurrency in a Triangle Using Geometer's Sketchpad Resource Type: Instructional Resource -- Best Practice Discipline: Mathematics Ohio Standards Alignment: Grades 9–12 Professional Commentary: This lesson enhances student knowledge of how to use Geometer's Sketchpad™ to explore geometric concepts that take much longer to do using hand-held tools, specifically in this case, the points of concurrency in a triangle. The unit begins with a key-by-key introduction to Sketchpad, followed by the construction of line segments, triangles, circles, perpendicular bisectors of line segments, angle bisectors, altitudes of triangles, and medians of triangles.... 1082 Gravel Roads and Sinusoidal Patterns Resource Type: Instructional Resource -- Promising Practice Discipline: Mathematics Ohio Standards Alignment: Grades 10–12 Professional Commentary: This lesson provides an opportunity for students to apply their knowledge of sine and cosine curves to analyze and model data from tables of gravel road erosion data. They will use graphing calculators to compare best fit models to the given data.... Resource Type: Instructional Resource -- Promising Practice Discipline: Mathematics Ohio Standards Alignment: Grades 10–12 Professional Commentary: Students use a graphing calculator, CBL, and motion detector probe to study the harmonic motion of a Barbie® or similarly sized doll bouncing on the end of an elastic band. They determine the relative minima, maxima, period, and amplitude of the resulting periodic function and apply these ideas to human bungee jumping.... 1084 Tweaking a Trigonometric Function -- An Exploratory Lesson Resource Type: Instructional Resource -- Promising Practice Discipline: Mathematics Ohio Standards Alignment: Grades 10–12 Professional Commentary: This lesson demonstrates the various translations of y = A sin B(x + C) + D and y = A cos B(x + C) + D based upon changes in A, B, C, and D. Graphing calculator overlay graphs make it easy for students to detect, understand, and predict the relationship between changes in parameters and translations in periodic curves.... Projects: COR 1085 Simulations Using the Random Number Table Resource Type: Instructional Resource -- Promising Practice Discipline: Mathematics Ohio Standards Alignment: Grades 9–12 Professional Commentary: This unit introduces the use of a random number table for performing simulations in probability. Each simulation follows the five (5) steps of: stating the problem, stating the assumptions, assigning the digits, simulating the experiment, and stating the conclusions.... 1086 Glued to the Tube or Hooked to the Books? Resource Type: Instructional Resource -- Promising Practice Discipline: Mathematics Ohio Standards Alignment: Grades 7–10 Professional Commentary: Students collect data on their study and TV viewing time over a period of several days. They use a graphing calculator, with step by step instructions, to find measures of central tendency, construct a box and whiskers graph, construct a scatter plot of class data, and look for a line of best fit. Activity sheets and suggestions for assessment are included.... Resource Type: Instructional Resource -- Promising Practice Discipline: Mathematics Ohio Standards Alignment: Grades 9–12 Professional Commentary: Students roll a ball up a ramp at various angles of incline. A CBL and an ultrasonic motion detector measure the position of the ball relative to the detector at regular time intervals as the ball rolls up and then back down the ramp.... 1088 Just a Typical American Student? Resource Type: Instructional Resource -- Promising Practice Discipline: Mathematics Ohio Standards Alignment: Grades 5–8 Professional Commentary: Working in groups, students use a graphing calculator and the instructional activity sheets to gather data, calculate statistics, construct graphs, and make inferences. The students communicate their findings in a summary letter.... 1089 Dinner at the Rabbit Cafe: A Predator-Prey Investigation Resource Type: Instructional Resource -- Promising Practice Discipline: Mathematics Ohio Standards Alignment: Grades 10–12 Professional Commentary: In this multi-day lesson, students work collaboratively to develop models to simulate population growth. They investigate how paramenters, such as the number of encounters that occur between the the rabbits and foxes, affect the data in predator-prey relationships. Spreadsheets and graphing calculators with a sequencing mode are used. The goal is for students to find values of the parameters that... 1090 Stomach Turner Roller Coaster Resource Type: Instructional Resource -- Promising Practice Discipline: Mathematics Ohio Standards Alignment: Grades 10–12 Professional Commentary: This unit teaches students to recognize, graph, and write equations for sinusoidal curves with and without the use of technology. Students analyze the amplitude, period, horizontal shift, and vertical shift of sinusoidal curves and recognize the connection between the graphical and algebraic representations of a function.... Projects: COR |