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Worksheet
Curated OER

Tangents

For Students 9th - 12th
For this tangents worksheet, students determine the length of a missing side of a right triangles.  They use tangent lines to solve problems.  This two-page worksheet contains 11 multi-step problems.
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Interactive
Curated OER

Tangents

For Students 10th - 12th
In this tangents worksheet, students use tangent ratios to find the length of the sides of right triangles. This one-page worksheet contains 10 multi-step problems.  Answers are provided.
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Lesson Plan
Curated OER

The Odyssey - By Homer

For Teachers 8th - 10th
Students read and interpret the epic poem The Odyssey by Homer. They interlock this poem to other spectacular people or events such as Amelia Earhart and the Bermuda Triangle. A vast array of excellent assignments are given within this...
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Lesson Plan
Curated OER

Area Formulas

For Teachers 6th - 8th
Middle schoolers use the area formula for a rectangle to identify the area formulas for triangles, parallelograms, and trapezoids. In groups they complete a variety of worksheets, and examine irregular figures whose areas can be...
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Lesson Plan
Texas Instruments

Getting Started with Cabri Jr.

For Teachers 9th - 12th Standards
Pupils construct geometric figures using Cabri Jr. in this constructing geometric figures using Cabri Jr. activity. They familiarize themselves with Cabri Jr. and construct segments and triangles. Your learners will use various tools to...
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Worksheet
Curated OER

Geometry Standardized Test Practice

For Students 10th
In this angles and figures review activity, 10th graders solve and complete 39 different multiple choice problems. First, they find the length of a line between two given points. Then, students name the type of transformation and the...
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Worksheet
Curated OER

Learning Colors and Shapes

For Students 2nd - 4th
In this colors and shapes learning exercise, students look over a box full of different shapes, color the triangles red, squares blue, rectangles yellow, ovals green, circles purple and the diamonds orange.
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Worksheet
Curated OER

Ratio

For Students 6th
In this ratio worksheet, 6th graders practice problem solving 10 mathematical word problems involving the ratio between measurements and triangles.
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Worksheet
Curated OER

Find the Surface Area of the Triangle

For Students 9th - 10th
For this geometry worksheet, learners are asked to solve for the surface area of a triangle and a trapezoid. They are fiven the height and base. There are 2 questions with an answer key.
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Interactive
Curated OER

Pythagorean Theorem

For Students 6th - 10th
In this measurement activity, students will be given 2 sides of a right triangle, they will determine if the missing side is a leg or the hypotenuse. They will use the Pythagorean Theorem to create an equation and find the length of the...
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Lesson Plan
Curated OER

Trig functions and Triangles

For Teachers 7th - 9th
Here is a basic plan for the beginning teacher to use for introducing the class to the right triangle trigonometric functions. It outlines the lesson objectives, class procedures, and basic instructional techniques that could be used. 
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Worksheet
Curated OER

Equilateral Triangles

For Students 1st - 2nd
In this equilateral triangles worksheet, students study the various triangles to identify equilateral triangles. Students may count the triangles.
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Worksheet
Curated OER

Brain Teaser- How Many Triangles?

For Students 4th - 5th
In this geometry worksheet, students examine a picture that has many hidden triangles. Students count the triangles they discover and color the picture.
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Lesson Plan
Curated OER

Toothpick Triangles

For Teachers 8th - 12th
Explore patterns, variables, and mathematical relationships when you examine patterns with toothpicks and determine the next sequence of figures. Your class writes and justifies a formula based on the sequence. An answer key is included.
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Lesson Plan
Curated OER

Area of Parallelograms and Triangles

For Teachers 8th - 10th
Students explain the formula for finding the area of a paralellogram and its relation to the area of a rectangle. Finally, they construct the formula for the area of a paralellogram.
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Lesson Plan
Curated OER

Triangles & Congruence, Proportions & Similarity, Right Triangle & Trigonometry

For Teachers 9th - 12th
High schoolers are introduced to the topic of congruence and proportions in Geometry. Using technology, they construct and validate the properties of various geometric figures and identify whether it is congruent or proportion to the...
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Lesson Plan
Curated OER

Triangles

For Teachers 3rd
Third graders recognize geometric shapes with acute angles, make geometric shapes with acute angles on geoboards, and draw acute angles on geopaper.
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Interactive
Noetic Learning

Kinds of Triangles (Online Interactive)

For Students 3rd - 4th
In this triangles learning exercise, students analyze pictures of four triangles. For each triangle, students mark if it is acute, obtuse, or right.
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Lesson Plan
Alabama Learning Exchange

Is It a Triangle?

For Teachers 9th - 12th Standards
High schoolers explore the concept of triangle inequalities.  In this triangle inequality lesson, students cut spaghetti noodles into given lengths.  High schoolers use the noodles to complete a worksheet about triangle inequalities. ...
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Lesson Plan
Curated OER

Visuals Patterns in Pascal's Triangle

For Teachers 7th - 12th
Students examine Pascal's Triangle and attempt construct it on their own.  In this visual patterns lesson students explore patterns that exist in Pascal's triangle.
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Lesson Plan
Curated OER

Simply Similar at Sea: Simple Triangles

For Teachers 10th
Tenth graders answer a variety of problems based on similar triangle and learn about the rule of thumb. They will test the rule of thumb by estimating the distance to an object in the classroom.
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Lesson Plan
Curated OER

Congruent Triangles - Is This Enough Information?

For Teachers 7th
Seventh graders examine congruence postulates and apply knowledge to triangles in the world around them.
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Worksheet
Curated OER

The Area of a Triangle

For Students 5th - 6th
In this area of a triangle instructional activity, students solve 30 problems in which the area of triangles are calculated. There is instruction on the page. This is intended for on-line use but can be done on paper.
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Worksheet
Curated OER

Triangle Angle Sort

For Students 10th
For this triangle and angle worksheet, 10th graders identify 36 different angles and triangles illustrated on the sheet. First, they define the vocabulary to include equilateral, scalene, right, and isosceles triangle. In addition, they...

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