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Second graders identify shapes and their characteristics. In this geometry lesson, 2nd graders define geometric terms such as faces, corners and edges before completing a worksheet. Students participate in a tic-tac-toe style game while answering geometry questions correctly.
Tenth graders explore Cabri Jr. In this geometry lesson, 10th graders investigate the menus, tools, and capabilities of Cabri Jr. as a tool to enhance student understanding. The lesson includes the construction of a triangle and the perpendicular bisectors of a triangle and an investigation into the sum of the measures of the angles of a triangle.
Students explore the concept of concurrent lines in triangles. In this concurrent lines in triangles lesson, students work in groups to investigate properties of concurrent lines in acute, right, and obtuse triangles. Students use a worksheet to guide them through their investigation.
Tenth graders explore parallel lines cut by a transversal. In this geometry lesson, 10th graders explore the relationships that exist among the eight angles formed when parallel lines are cut by a transversal. The dynamic nature of Cabri Jr. allows for conjecture and verification regarding the angle relationships.
Tenth graders investigate parallel lines. In this geometry lesson plan, 10th graders explore the measures of the angle formed when parallel lines are cut by a transversal. This lesson plan focuses on the sum of the measures of the two interior angles on the same side of the transversal. The dynamic nature of Cabri Jr. allows students to form and verify conjectures.
Use the given tasks and detailed teacher's commentary to introduce your 8th graders to the Pythagorean theorem and its converse. Embedded links to information about Egyptian geometry make your presentation interesting. Consider giving your class members a 12-inch piece of yarn with which to demonstrate a right triangle and the Pythagorean theorem triples the way that this ancient culture did.
Which shapes are symmetrical? Third graders decide which shapes have lines of symmetry, and which shapes are not symmetrical. They work on 13 shapes and symbols, four of which have lines already drawn through them. Use this resource to reinforce your elementary geometry lesson.
How do you show that something is a rectangle? This activity starts with four coordinate points and asks young geometers to explain whether they create a rectangle. Knowledge from both geometry and algebra come into play here, as well as, exploring many different approaches to solve this problem; making this a good small group activity. See how many solutions your class can find!
Tenth graders define the properties of tangent and secant lines. In this circles lesson, 10th graders use two lines and a circle to find ways that they relate by illustrations. Students also investigate lines that intersect at the center and lines intersecting inside the circle but not at the center.
Middle schoolers and algebra learners determine if a slope is positive or negative in this math lesson. They express slope as a fraction, and use slope triangles to determine the slope on a worksheet. Also, they discuss differences between lines with positive or negative slope.