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Congruent Triangles
Students explore the concept of congruent triangles. In this congruent triangles instructional activity, students use Cabri Jr. to construct two congruent triangles using circles. Students determine if the two triangles are...
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NUMB3RS Activity: Regular Ploygon Centroids
Students investigate geo-profiling. For this secondary mathematics lesson, students use geo-profiling to determine the most probable location of a criminal. Students find the centroid of a polygon where the vertices represent...
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Investigating Tessellations in 2 Dimensions
Learners analyze tessellations. In this geometry lesson, students discover which shapes can or cannot be used to create a tessellation. Learners watch a video, then create their own tessellations.
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A Penny for Your Height
Students investigate measurement. In this fifth/sixth grade mathematics lesson, students explore the relationship between inches and centimeters. Students measure their height in inches or centimeters and convert the...
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Exploring Transformations with Matrices
A page right out of the Holt Geometry book. Use a graphing calculator and graph paper to explore transformations with matrices.
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Volume Review
Learners investigate the concepts of volume for rectangular prisms and spheres. They measure the volume of one balloon and then consider how many breaths it would take to fill the room with balloons. The rectangular prism being measured...
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Fraction Flags
Students research flag designs and their geometric configurations. They design their own fraction flag and utilize the concepts of measurement, geometry and fractions to their designs. Each student attaches a craft stick or short dowel...
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Tin-Foil Twinkles
Students compare and discuss characteristics and properties of 2- and 3-dimensional shapes. They construct 3-dimensional paper star figures, imaginatively customizing them with art tools and craft materials. Students analyze their...
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Exploring Areas of Irregular Polygons
Students solve for the area of different polygons. In this geometry lesson, students identify and differentiate between regular and irregular polygons. They use properties of irregular polygons to solve problems.
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Identifying and Describing Polygons
Pupils identify the different properties of polygons. In this geometry lesson, students differentiate between polygons and non-polygons. They review important vocabulary to help them understand the properties of polygons.
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Incenter of a Triangle
Tenth graders explore the properties of the incenter of a triangle. In this geometry lesson, 10th graders construct a triangle and the angle bisectors of each angle. The dynamic properties of Cabri Jr. allow students to locate and...
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Fixed Perimeter Rectangle
Teach how to solve for the area and perimeter of rectangles. In this geometry lesson, students are given fixed perimeter rectangles and asked to find the area and side length of the rectangles. they draw their rectangle on the navigator...
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The Flat Earth
Young scholars differentiate between different planes. In this geometry lesson, students differentiate between a plane and a sphere. They discuss the Great Circle, Geodesic and Lune as it relates to the earth.
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Types of Triangles
Students classify triangles by the length of their sides. In this geometry lesson, students use a white board to demonstrate the angles of various triangles. Students construct an equilateral, isosceles, and a scalene triangle.
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Intersecting Lines and Segments of Measures
Mathematicians measure intersecting lines-and circles, and create chords. In this geometry lesson, young scholars explore interrior and exterior chords created by tangent and secant lines. These segments can be inside the circleor...
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Product of Chord Segments
Students creating chords intersection using circles. In this geometry instructional activity, students create visuals of chords ad their properties using Cabri technology. They measure the chords and explore the relationship among chords.
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Calculating Distances in Two and Three Dimensions
Students use the Pythagorean Theorem to solve problems. In this geometry lesson plan, students solve for the distances by calculating the different parts of the shape of a two and three dimensional shape. They reason by analogy.
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Measure the Earth's Circumference
Students explore geometry by conducting a science experiment. In this circumference measurement lesson, students review the Greek geographer Eratosthenes who first discovered the circumference of our planet. Students utilize...
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Euler Characteristic
Students identify the different properties of Euler's Characteristics. For this geometry lesson, students identify the shape and surface a polygon. They relate the concept of Euler to solving real world problems.
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Measurement of a Central Angle
Students calculate the measurement of a central angle. In this geometry activity, students identify properties of circles. They use Cabri software to create and analyze graphs.
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Arc Measurement Based on The Measurement of a Central Angle
Students define keywords that are important to solve problems. In this geometry lesson, students find the arc length and angle of a circle. They convert between radians and degrees.
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Exploring Chords: Products of Chord Segments
Students identify the properties of chords. In this geometry lesson, students multiply chord segments to find the solution to their problem. They construct two chords that cross on a circles.
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Tricky Traps
Students create identify properties of trapezoids. In this geometry lesson, students calculate the area of given trapezoids and review the area formula for parallelograms. They draw a correlation between the area of a trapezoid and that...
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Pushing Pivots
Students calculate the area and diameter length of a circle. In this geometry lesson, students investigate the use of pivots as they review parts of a circle. They create a circle using cardboard and label all the parts.