Curated OER
Constructing Parallel Lines
Students construct parallel lines using a protractor and a straightedge. In this geometry activity, students identify the properties of parallel lines. They use Cabri to graph and observe the lines.
Curated OER
The Minimal Distance Point from the Vertices of a Triangle
Students calculate the distance from the vertex of a triangle to the center. In this geometry activity, students find the shortest distance between a point and the vertex of a triangle. They relate this concept of distance to the real...
Curated OER
Properties of Special Parallelograms
Learners identify properties of parallelograms. In this geometry lesson plan, students label polygons as parallelogram or not. They define and label the properties of a kite.
Curated OER
Exploring the Slopes of Parallel and Perpendicular Lines.
Learners find the slopes for perpendicular and parallel lines. For this geometry lesson, students differentiate between parallel and perpendicular lines. They use Cabri software to create lines to compare.
Curated OER
Pythagorean Theorem: Triangles and Their Sides
Students investigate triangles and their relationship to each other. In this geometry lesson, students solve right triangles using the properties of the Pythagorean Theorem. They differentiate between right, acute, straight and oblique...
Curated OER
Exploring Special Lines
Students compare and order numbers. In this geometry lesson, students write equations for inequalities. They differentiate and apply concepts of triangular properties to solve problems.
Curated OER
Geometry Slideshow
Sixth graders create slideshows of geometric terms. They use images taken with digital cameras or scanned from magazines.
Curated OER
Incenter of a Triangle
Tenth graders find the incenter of a triangle. In this geometry lesson, 10th graders define the way to create an incenter with an angle bisector. They differentiate between incenter and incircle.
Curated OER
Triangles with Collinear Circumcenters
Students identify the circumcenter of a triangle. In this geometry lesson, students construct a perpendicular bisector using a straight edge and a compass. They differentiate between triangles and collinear points.
Curated OER
Tessellations
Students create tessellations. In this geometry instructional activity, students use polygons to create different patterns by rotation. They identify the reasons for polygons to create the type of tessellation it does.
Curated OER
The Dragon Curve Fractal
Learners identify the properties of a dragon curve. In this geometry instructional activity, students identify sequences and patterns as they solve fractals. They investigate patterns found in nature.
Curated OER
Constructing Midsegments of Triangles
Pupils construct midsegments. In this geometry instructional activity, students make conjectures and apply properties of triangles to solve problems. They complete an activity on the computer.
Curated OER
Circumscribed Polygons
Students investigate polygons and construct ferris wheels. In this geometry lesson plan, students create a circle and differentiate properties of circles and polygons. They compare the relationship between angles and circumscribed polygons.
Curated OER
Areas of Polygons
Students calculate the are of regular polygons. In this geometry lesson, students create polygons on the computer and move it around to create different shapes. They explore the area of different polygons and how they inter-relate.
Curated OER
Geometry in Art
Students examine mathematical symbols and formulas included in works of art. They analyze quilts for shapes and they each make their own quilt from squares using geometric shapes.
Concord Consortium
Orthogonal Circles
Here's some very interesting circles for your very interested pupils. A performance task requires scholars to sketch a pair of orthogonal circles so the centers are the endpoints of one side of a triangle. They draw an additional circle...
Computer Science Unplugged
Battleships—Searching Algorithms
How does a computer perform a search in order to find data? The lesson begins with a demonstration on finding one number out of 15. Pairs then play three games of Battleship by using different search techniques. The lesson...
Drexel University
Learning Roomba Module 5: Localization
Where is my robot? Pupils create programs that utilize the localization services that a Roomba uses to determine its surroundings.
Virginia Department of Education
Distance and Midpoint Formulas
Small groups work through two guided activities to derive the distance and midpoint formulas for the coordinate plane. The activities begin with concrete examples and move to abstract.
CK-12 Foundation
Method of Cylindrical Shells
Approximate the volume of a solid of revolution. Using a method similar to approximating the area under a curve, pupils investigate the volume of a solid of revolution. The learners use a given definite integral to find the volume of...
Curated OER
The Pythagorean Theorem
Young scholars research Pythagoras and learn how to apply his theorem. They solve real life problems using the theorem and demonstrate knowledge of exponents, equations, and radicals. Students include diagrams in their research papers.
Curated OER
SSS, SAS, ASA, and AAS Congruence
Learners will determine if triangles are congruent and state the appropriate congruence theorem. In this geometry lesson, students will determine what information is needed to determine if a pair of triangles are congruent using ASA,...
Curated OER
Exploring the Centroid of a Triangle
Pupils examine the centroid of a triangle as they use Cabri Jr. to construct a triangle and its medians. The dynamic nature of the software allows learners to measure the lengths of the segments in the triangle and conjecture and verify...
Curated OER
Measuring Angles in a Quadrilateral
High schoolers explore quadrilaterals in this geometry instructional activity. They will draw a quadrilateral, measure the angles, and find the sum of the measures of the interior angles using Cabri Jr. The interactive capabilities of...