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Obtuse Triangles
Fourth graders explore obtuse triangles. In this geometry lesson, 4th graders make obtuse triangles with paper and scissors. They determine how to find the center of their triangle.
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Scale factors: Ratios and Proportions
Students create building and models using scale factors. In this geometry lesson plan, students apply the properties of ratio and proportion to solve problems. They identify the means and extremes property of cross multiplication.
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Six Squares
Students create different shapes on grid paper. In this two-dimensional geometry lesson, students take turns outlining a shape made of six squares on the graph paper. They identify all shapes they see once everyone has had a...
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Angle Action 1,2 and 3
Students investigate angles through construction. In this geometry lesson plan, students use a protractor to identify the measurement of an angle. They identify angles cut by a transversal and two parallel lines.
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Folding Circles
Students explore circles. In this introductory geometry lesson, students cut out a circle and follow a series of instructions given by the teacher. Students fold the circle, answer questions, and draw conclusions.
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"Geotown" Scrapbook
Students create a scrapbook. In this geometry lesson, students use digital cameras to take pictures of geometrical concepts. Students use the pictures to create a "Geotown" scrapbook.
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CSI Investigation
Young scholars solve real life situation using the Pythagorean Theorem. For this geometry lesson, students calculate the length, midpoint and slope of segments. They solve word problems using properties of square roots.
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Sectors of Pizza
Students identify the properties of a circle. In this geometry lesson, students relate properties of diameter to sections of a pizza. They calculate the measure of an arc and missing angles.
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Ara of Circles
Students identify the differentiate the different properties of circles and parallelograms. In this geometry lesson, students calculate the area of each solid and identify the formula. They relate Pi to the circumference of a circle.
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Chors, Secants, Tangents
Students identify the relationship between chords, secants and circles. In this geometry lesson plan, students calculate the length of the chords. They sketch the secant lines on a circle.
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Crop Circles
Students calculate the area and circumference of a circle. In this geometry lesson, students solve word problems with circles and create formulas to calculate the area. They find the rate and complex area of a circle.
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Transformations-Translations
Learners perform transformations and translation on a coordinate plane. In this geometry lesson, students move shapes around on a graph identifying translation, image, and transformation. This lesson has an interactive part online that...
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Congruence with Robot Gobot
Students identify the properties of solids and polygons. In this geometry lesson plan, students identify the different measurements of a triangle. They use congruence parts and theorem to prove their answer.
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Pythagorean Theorem
Pupils apply properties of Pythagorean to solve problems. In this geometry lesson, students identify the different parts of a right triangle using ratios. they solve problems using squares and square roots.
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Area Of Sectors
Student find the area of a sector of a circle. In this geometry lesson, students define the sector of a circle using a sketch. They find and identify examples of sector in the real world.
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Pyramids- Slant Height and Altitude
Students calculate the height and altitude of a pyramid. In this geometry lesson, students define the parts that make up a pyramid. They use the Pythagorean Theorem to find the missing parts of a pyramid.
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Radius, Diameter and Area
Students identify the radius and diameter of a circle. In this geometry lesson, students calculate the volume and area of a cylinder and circle. They relate the circumference of a circle to Pi.
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Unit Circle and Triangle
Pupils apply the Unit Circle to solve ratios of triangles. In this geometry instructional activity, students derive the different ratios of a triangle using the Pythagorean Theorem. They find the angles of a unit circle using a right...
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Congruent and Similar figures
Eighth graders explore congruent and similar figures. In this eighth grade geometry instructional activity, 8th graders use geoboards to create congruent and similar figures and explore the relationships between the sides and...
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Surface Area of Cubes and Rectangular Prisms
Eighth graders calculate surface area of 3-D shapes. In this geometry lesson, 8th graders analyze cubes and prisms by finding their area and surface area. They compare the data of these two shapes.
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Folding to Make Shapes
Second graders identify different polygons and their attributes. In this geometry lesson, 2nd graders get to know polygons by studying the vocabulary and finding polygons in their classroom. They create these shapes and then find their...
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Proportional Similarities
Students model the geometric relationship with graphing. In this geometry lesson plan, students differentiate between parallel, perpendicular, similar and congruent shapes. They use properties of polygons to differentiate their...
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Arc Length - Horse
Students define an arc and calculate its length. In this geometry lesson plan, students find examples of arc in the real world. They show their understanding of arcs through problem solving.
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Quadrilateral Bunny
Students identify the properties representing quadrilateral. In this geometry lesson plan, students differentiate between special and regular quadrilaterals. They discuss and demonstrate hierarchy of quadrilaterals.