Geometry Teacher Resources

Find Geometry educational ideas and activities

Showing 1 - 20 of 8,796 resources
Learners investigate complementary and supplementary angles. They use dynamic geometry (TI-nspire) software to manipulate rays to identify the conditions necessary to create complementary and supplementary angles.  They find the measure of the missing angle given one angle in a pair.
Students investigate properties of special right triangles. In this geometry instructional activity, students use the Pythagorean Theorem to solve for missing angles and sides. They perform reflections.
Fifth graders explore geometric building blocks in the real world in order to describe the characteristics and relationships of points, lines, line segments, rays, and planes. This is the first lesson plan in a series of lessons in geometry.
Students view geometry in the world around them. In this geometry lesson, students look at buildings and find examples of symmetry and geometry. They look for 2D and 3D shapes and congruency. 
Students view a right triangle displayed by the teacher. Students measure legs and the interior angles of the triangle. They look for a pattern or relationship between the legs and angles. Students use pegboards and string to create more isosceles right triangles. They listen as the teacher explains the Pythagorean Theorem.
Students investigate the sphere and the postulate of Euclid. In this geometry lesson, students differentiate between euclidean geometry and non-euclidean geometry.
Eighth graders complete a unit of lessons on basic geometry concepts. They participate in a variety of activities, culminating in a project that involves publishing a booklet or a poster that presents the major geometry concepts from the unit.
Third graders investigate shapes in our world. In this geometry lesson, 3rd graders describe plane and solid shapes and identify angles, solid objects and lines of symmetry. Students use online resources, graphic organizers and conduct research to gain a better understanding of this geometry unit.
Tenth graders analyze objects by name and sides. In this geometry activity, 10th graders solve geometric equations using the sides and n-gons. They observe picture slides and draw conclusions.
Tenth graders explore geometry with the TI-nspire.  In this geometry lesson, 10th graders investigate the menus and tools of the TI-nspire.  The lesson includes directions for basic constructions, storing and using measurements, and matrix operations. 
Students investigate a variety of two-dimensional polygons which are divided and combined to determine various properties. The figures are compared, contrasted, and classified.
Use geometric principles to analyze North American quilt patterns. Learners review the concept of area, perimeter, and symmetry. They explore the importance of the star in quilting and conduct research on Morning Star quilts using the Internet. This lesson would be great for an Open House or Math night!
A home improvement plan can help adult learners preparation for the GED exam. They review vocabulary, prepare diagrams, complete a worksheet, calculate perimeters and analyze how to approach a story problem. They identify many geometry concepts used in solving GED problems.
Students use a geometric tool to help them determine the relationships between the diameter, circumference and area of a circle. They also determine the relationships of topics for a square.
Young scholars explore geometry related to real world situations and tangrams. They explore a math website, identify various shapes, draw and describe shapes, read about the history of tangrams, and create their own set of tangrams out of paper.
In this geometry worksheet, 6th graders find the measurement of the angles in different shapes given. Students complete 15 problems.
In this geometry activity, 6th graders find the measurement of the angles in many different shapes. Students complete 15 problems.
Help 9th graders identify lines, points, rays, and planes in geometry. They  practice identifying, measuring, and drawing angles of different degrees. This is a fundamental lesson to help students learn the building blocks of geometry.
Tenth graders investigate triangles.  In this geometry lesson, 10th graders explore the relationship between an exterior angle of a triangle and the remote interior angle.  The dynamic nature of Cabri Jr. allows for conjecture and verification.
Tenth graders explore non-Euclidean geometry.  In this geometry instructional activity, 10th graders investigate “taxicab geometry.”  Students investigate the taxicab distance formula and make comparisons between a circle in Euclidean geometry and a circle in taxicab geometry.