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Lesson Plan
EngageNY

The Scaling Principle for Area

For Teachers 9th - 10th Standards
As they investigate scaling figures and calculate the resulting areas, groups determine the area of similar figures. They continue to investigate the results when the vertical and horizontal scales are not equal. 
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Lesson Plan
Curated OER

Geometry Everywhere; Fractal, Math & Form

For Teachers 9th - 12th
High schoolers explore fractal geometry. They do online explorations of fractals to discover applications of fractal geometry for a report.
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Lesson Plan
Curated OER

Pythagorean Theorem

For Teachers 9th - 12th
Students identify a right angle and right triangle. They perform WebQuests searching for similar figures and solve for the length of one of the sides given the other two.
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Lesson Plan
Curated OER

Pythagorean Theorem

For Teachers 9th - 12th
Students are introduced to the Pythagorean theorem. They use three different activities that give students the opportuntiy to observe triangles, and use the Pythagorean theorem and practice different ways of determining areas of...
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Lesson Plan
Curated OER

The Geometry of Means

For Teachers Higher Ed
In this geometry worksheet, students are given a rectangle and a square. They verify ratios when given equal perimeters or areas. Students are given adjacent squares. They find the distance between the centers, and identify the means...
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Worksheet
Curated OER

Area and Periemeter

For Students 10th
In this geometry worksheet, 10th graders determine the area and perimeters of various quadrilaterals and triangles.  The one page worksheet contains ten problems.  Answers are not provided. 
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Lesson Plan
Curated OER

Geometry

For Teachers 9th - 12th
Students examine how similar triangles have same angle measures.
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Lesson Plan
Curated OER

Studying Special Segments in Triangles

For Teachers 8th - 10th
Pupils investigate special segments in triangles. In this geometry lesson, students graph, compare, estimate and predict findings based on their data. They differentiate between similarity and congruence of triangles.
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Lesson Plan
Curated OER

Geometry Jeopardy

For Teachers 9th - 11th
Learners identify the pattern in a problem. In this geometry lesson, students make predictions, collect and analyze data. They apply the idea of scales and measurements to the real world.
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Lesson Plan
Curated OER

Primary Geometry

For Teachers K - 2nd
Students identity simple geometric shapes. In this early geometry lesson, the teacher introduces students to triangles, squares, and rectangles, then students identify and classify the shapes as they are found in the classroom. To...
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Lesson Plan
Curated OER

Soda Cans

For Teachers 8th - 10th
Students identify and use properties of similar figures. In this geometry lesson, students use proportions of the sides of triangles to solve triangular relationships. They use soda can as their visuals.
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Lesson Plan
Curated OER

Looking For Triangles

For Teachers 8th - 10th
Students solve problems with triangles. In this geometry instructional activity, students analyze shapes to find different triangles. They name the shapes created by putting triangles together.
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Lesson Plan
EngageNY

Points of Concurrencies

For Teachers 9th - 10th Standards
You say that perpendicular bisectors intersect at a point? I concur! Learners investigate points of concurrencies, specifically, circumcenters and incenters, by constructing perpendicular and angle bisectors of various triangles.
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Lesson Plan
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EngageNY

Definition and Properties of Volume

For Teachers 9th - 10th Standards
Lead a discussion on the similarities between the properties of area and the properties of volume. Using upper and lower approximations, pupils arrive at the formula for the volume of a general cylinder. 
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Interactive
CK-12 Foundation

Secant, Cosecant, and Cotangent Functions: Hold the Ladder!

For Students 9th - 12th Standards
Determine the length of a falling ladder. Pupils use an interactive to find the angle a ladder makes with the floor after it falls to answer questions. The scholars use the triangle formed in the interactive to determine values of...
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Interactive
CK-12 Foundation

Distance Between Two Polar Coordinates: Exploring Changes in Angle and Radius

For Students 10th - 12th Standards
Get straight answers on a curved grid. An interactive has learners apply the Law of Cosines to find the distance between two points on the polar coordinate plane. The pupils use the radii lengths and the angle between the two radii to...
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Interactive
CK-12 Foundation

Sequence of Partial Sums: Partial Sums

For Students 11th - Higher Ed
Have some fun building squares out of triangles. Pupils investigate the partial sums of odd numbers. Using the sum of the first four odd numbers, learners see that it can be rewritten as a sum containing a triangular number. Simplifying...
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Lesson Plan
Curated OER

Angle Exploration and Classification

For Teachers 4th - 7th
Students compare and contrast angles and identify them as acute, obtuse, right, or straight angles. They create rays and angles using uncooked spaghetti, read and discuss key vocabulary terms, and complete a variety of geometry worksheets.
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Lesson Plan
Curated OER

Introduction to Fractals: Geometric Fractals

For Teachers 6th - 8th
Middle schoolers study and observe the patterns made by the areas of the Sierpinski Triangle. Students use the computer to draw two or three iterations to discover the number patterns. Middle schoolers complete worksheets based on...
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Worksheet
Curated OER

The BUDGET Truck Problem

For Students 10th - 11th
In this secondary mathematics worksheet, students solve a problem which involves how far behind a rental truck must the driver of a car be so that he can see a stoplight from behind the truck.  The problem can be solved with similar...
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Lesson Plan
Curated OER

Fractal and the Dragon Curve

For Teachers 11th - 12th
Learners explore Fractal designs. In this geometry lesson plan, students observe the different polygons created in nature and relate it to math. They define polygons on planes and rotate polygons about a point.
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Worksheet
Curated OER

Proportional Parts Homework

For Students 9th - 10th
In this geometry instructional activity, students differentiate between similarity and proportion. They use scale factor as they solve for the different proportions. There are 15 questions.
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Lesson Plan
Curated OER

The Corner Problem

For Teachers 11th - Higher Ed
Students explore the concept of the corner problem. In this corner problem lesson, students use the TI-NSpire to determine the maximum length a rod can be and still pass horizontally around a corner. Students use similar triangles to...
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Lesson Plan
Curated OER

Origami Frogs

For Teachers 9th
Ninth graders explore a variety of geometry and science concept while making an origami frog. The fold paper into the shape of a frog and conduct measurement activities including frog leaps.