Curated OER
Mapping the Aegean Seafloor
Earth science learners create a two-dimensional topographic map of the floor of the Aegean Sea. They use it to then create a three-dimensional model of the ocean floor features. This comprehensive resource delivers strong background...
EngageNY
Prove the Pythagorean Theorem Using Similarity
Amaze your classes with the ability to find side lengths of triangles immediately — they'll all want to know your trick! Learners use the Pythagorean Theorem and special right triangle relationships to find missing side lengths.
EngageNY
Searching a Region in the Plane
Programming a robot is a mathematical task! The activity asks learners to examine the process of programming a robot to vacuum a room. They use a coordinate plane to model the room, write equations to represent movement, determine the...
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Experiments with Inscribed Angles
Right angles, acute angles, obtuse angles, central angles, inscribed angles: how many types of angles are there? Learners first investigate definitions of inscribed angles, central angles, and intercepted arcs. The majority of the lesson...
EngageNY
Unknown Length and Area Problems
What is an annulus? Pupils first learn about how to create an annulus, then consider how to find the area of such shapes. They then complete a problem set on arc length and areas of sectors.
EngageNY
Properties of Tangents
You know about the tangent function, but what are tangent lines to a circle? Learners investigate properties of tangents through constructions. They determine that tangents are perpendicular to the radius at the point of tangency, and...
EngageNY
Construct a Square and a Nine-Point Circle
Anyone can draw a square, but can you CONSTRUCT a square? Here is a resource that challenges math scholars to create steps to finish their own construction. They test their ability to read and follow directions to complete a construction...
Curated OER
Congruent and Similar figures
Eighth graders explore congruent and similar figures. In this eighth grade geometry lesson, 8th graders use geoboards to create congruent and similar figures and explore the relationships between the sides and angles.
Curated OER
Angles and Triangles
Eighth graders examine Jewish symbols. For this Holocaust lesson, 8th graders discuss the meanings behind the Swastika and the Star of David. Students also measure the angles and shapes with the symbols.
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Formula Determination
Learners derive a formula for the interior degrees in any convex polygon. In this geometric figure lesson, students determine the shapes of various polygons and the number of triangles formed. They use this information to derive the...
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Flips, Turns, and Slides: Adventures with Transformations
Students explore transformations. For this math lesson, students plot points on a coordinate grid and construct shapes. Students discuss movements on the grid as flips, turns and slides.
Curated OER
Finding the Shape of a Web
Pupils examine spider webs they find as they explore outside. They make T-chart of the shapes found in two different webs and draw them on geoboard paper. Next, they measure length and width of a spider's web before checking to see if...
Curated OER
Pedal Triangles
Students identify the properties and theorems of triangles. In this geometry lesson, students construct angle bisectors using a compass and straight edge. They identify triangular similarity and congruency.
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Menelaus' Theorem
Students investigate Menelaus Theorem. In this geometry instructional activity, students calculate the area of polygons. They differentiate between boundaries point, interior points and area of lattice points.
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Ceva’s Theorem
Students prove and use Ceva's Theorem to solve problems. In this geometry lesson, students analyze polygons for patterns and calculate the area of each shape. They relate polygons to the real world.
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Finite Geometry
Young scholars solve for the area and perimeter of polygons. In this geometry lesson, students identify repeated patterns and create formula to solve problems. They make conjectures and prove hypotheses.
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Fractions - One-Half and One-Fourth
First graders identify and create the fractions one-half and one-fourth. The teacher first demonstrates how to create the fractions on a geoboard. The students then create one-half and one-fourth of a square, triangle, and a rectangle on...
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Storefront Signs
Learners practice finding the areas and patterns within a square and explore the concept of quadratic functions. They observe and record the area values in a table, plot a graph of Area versus Distance and complete a variety of student...
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Courts of Measure
Students practice their area and perimeter measurement. In this measurement lesson, students watch a video about perimeter and area. Students measure a gym for perimeter and area. Students write number sentences for the area and...
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Math Mouth!
Students examine and discuss math vocabulary. They participate in various games involving the math vocabulary. Use this as a supplement.
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Triangle Town
Second graders create a fact family town to develop the understanding of numbers related in fact families. They learn each family has a big number and two baby numbers. They make triangle shaped houses for their facts.
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Ship Shape
Third graders experiment with, identify, and follow teacher-directed instruction toward understanding two-dimensional geometric shapes found within the environment. Groups of students utilize geoboards to help them explain geometric shapes.
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Exploring Geometric Patterns and Relationships
Sixth graders explore different geographic relationships in like drawing lines, rays, and parallelograms. This lesson could be used for review because it covers more than one concept. The students should have prior knowledge.
Curated OER
Data Comparison And Interpretation: North Korea, South Korea, And the United States
Ninth graders brainstorm "what they know about North Korea and South Korea." They determine the approximate distance from the United States to North and South Korea and create a graph comparing the birth rates, death rates, infant...