Geometry

Predicting Travel Time Using Line Graphs

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In this Cyberchase video segment, Harry wants to visit his grandmother. He decides that the cheapest way for him to get there is to travel by unicycle, but he wonders if he can get there before dark. Using a line graph, he tries to predict the amount of time it will take to travel the twenty miles, assuming he travels at a constant speed. Once he sets out on his unicycle, he charts his progress on a new line graph. After the first hour he appears to be ahead of schedule, but he is not able to keep up the pace and soon finds himself falling behind.

Calculating Rectangular Area | Cyberchase

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In this video segment from Cyberchase, the CyberSquad must measure two differently-shaped parcels of land to determine which has a larger area. The CyberSquad uses tarps, fence posts, and finally a grid made out of rope to count squares and determine the area of each parcel.

Scale City: Greetings from Sky-Vue Drive-In

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Greetings from Sky-Vue Drive-In takes students on a tour through the history of drive-in theaters and a visit to one that's still open and thriving in Winchester, Kentucky. Looking at shadows through the drive-in movie projector introduces the relationship of a shadow's size to its distance from the light source.

Measuring Segments: Geometry - Language and Labels

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Before learning any new concept (mathematical or otherwise), it's important to learn and use a common language and label concepts consistently.

Understanding the Pythagorean Theorem

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In this video, learn how to use the Pythagorean theorem to find distance between two points on a coordinate grid. In the accompanying classroom activity, students apply what they learned in the video as they solve similar problems and discuss solution strategies. To get the most from this lesson, students should be comfortable using the Pythagorean theorem to find an unknown side of a right triangle, graphing points on the coordinate plane, and finding the distance between points with the same x- or y- values.

 

Special Right Triangles: 45-45-90 (Right Isosceles) Triangle Side Ratios

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This module explains the 45-45-90 triangle (also known as a right isosceles triangle) and its side ratios.

Classifying Shapes: Categorizing Geometric Shapes - practice examples

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Do these exercises along with us. Remember what you've learned about perpendicular lines, and right, obtuse, and acute triangles.

Garfield'S Proof of the Pythagorean Theorem

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This module explains a proof of the Pythagorean Theorem developed by James Garfield, the twentieth president of the United States.

Angles with Triangles and Polygons: Triangle Angle - Multiple Ways to Solve

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Learn that there are multiple ways to solve for the angles of multiple triangles.

Triangles: Categorization by Angle or Equal Sides

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Learn how to use angle measurement and side length to classify triangles as scalene, isosceles, equilateral, acute, right, or obtuse.

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