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Worksheet
Curated OER

Identify Triangles

For Students 5th - 6th
In this triangle worksheet, students identify triangles as either, right, acute, obtuse, equilateral, scalene or isosceles. A reference web site is given for additional activities.
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Worksheet
Curated OER

Identifying Triangles

For Students 4th - 6th
In this triangle worksheet, students label triangles as acute, right, obtuse, scalene, equilateral or isosceles. A reference web site is given for additional activities.
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Worksheet
Curated OER

Identify Triangles #

For Students 4th - 6th
In this triangle worksheet, students identify triangles as scalene, equilateral, right, obtuse, acute or isosceles. A reference web site is given for additional activities.
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Worksheet
Curated OER

Finding Area of Triangles

For Students 5th - 6th
In this triangle worksheet, students find the area of a set of 4 triangles, writing their answer in a rectangle found beneath each. A reference web site is given for additional activities.
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Worksheet
Curated OER

Identify Triangles #2

For Students 5th - 6th
In this triangle worksheet, students identify a set of 4 triangles as either equilateral, isosceles or scalene. A reference web site is given for additional activities.
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Worksheet
Curated OER

Identify Triangles

For Students 4th - 6th
For this triangle worksheet, students identify a set of triangles, labeling as equilateral, scalene or isosceles. A reference web site is given for additional activities. 
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Worksheet
Curated OER

Identify Types of Triangles

For Students 4th - 6th
In this triangle worksheet, students identify triangles as either equilateral, scalene or isosceles. A reference web site is given for additional activities.
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Worksheet
Curated OER

Identify Triangles #3

For Students 3rd - 5th
In this triangle instructional activity, students identify triangles as obtuse, right, or acute, checking the correct answer. A reference web site is given for additional activities.
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Worksheet
Curated OER

Identify Triangles #2

For Students 5th - 6th
In this triangle activity, students identify a set of triangles as either acute, right or obtuse, checking the appropriate box beneath each. A reference web site is given for additional activities.
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Worksheet
Curated OER

Identify Triangles

For Students 4th - 6th
In this triangles worksheet, learners identify triangles as either Acute, right or obtuse. A reference web site is given for additional activities.
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Worksheet
Curated OER

Finding Area of Triangles

For Students 5th - 6th
In this area of triangles activity, students calculate the area of 4 given triangles, writing total area beneath each. A reference web site is given for additional activities. 
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Worksheet
Curated OER

Area of Triangles

For Students 5th - 6th
In this area learning exercise, students calculate the area of 4 triangles, writing answers in rectangles beneath each triangle. A reference web site is given for additional activities.
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Worksheet
Curated OER

Area of Triangles

For Students 4th - 6th
In this area of triangles activity, students calculate area for a set of 4 triangles, writing total area beneath each. A reference web site is given for additional activities.
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Worksheet
Curated OER

Area of Triangles

For Students 5th - 6th
In this area of triangles activity, students calculate the area of 4 given triangles, writing the answers in rectangles beneath each. A reference web site is given for additional activities.
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Worksheet
Curated OER

Constructions and Angles

For Students 6th - 10th
In this triangle constructing and classifying worksheet, students read through a tutorial on triangles and angles. Then, students complete 17 exercises in which they answer questions about angles and triangles. By clicking on the "Check"...
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Lesson Plan
Curated OER

Exploring the Hinge Theorem

For Teachers 9th - 10th
Students explore the application of Hinge Theorem. In this geometry lesson, students write inequalities, given two sides of a triangle. They solve problems with triangular inequalities using the proper theorem.
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Lesson Plan
Curated OER

Triangle Side Lengths and Angles Measures

For Teachers 9th - 10th
Learners identify missing sides and angles. In this geometry lesson, students use triangular theorems to identify the missing sides. They use the Pythagorean Theorem to find the different ratios of each side.
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Lesson Plan
Pennsylvania Department of Education

Kites: On the Right Track

For Teachers Pre-K - K
Students use the Pythagorean theorem to discover the relationships between the lengths of sides of a right triangle. For this right triangles lesson plan, students use their reasoning and mathematical skills.
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Lesson Plan
Curated OER

Plenty of Pythagoras

For Teachers 5th - 8th
Using a twelve foot knotted rope, students form a 3-4-5 right triangle. Following a discussion of observations about the lengths of the sides of the triangle, students use grid paper, scissors and a centimeter ruler to draw and measure...
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Lesson Plan
Curated OER

ARE YOU A TRIANGULATEER?

For Teachers 3rd - 6th
Students explore about triangles and their relationship to the worlld around them. They are able to identify triangular shapes in their environment. Students are able to communicate to one another their understanding of triangles outside...
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Lesson Plan
Curated OER

Angle-Side Relationships

For Teachers 9th - 12th
Students calculate the different sides and angles of a triangle. For this geometry lesson, students use triangular properties to define the relationship between two triangle. They identify missing angles using the interior angle theorem.
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Lesson Plan
Curated OER

Tessellation Trial and Error

For Teachers 5th - 8th
In this interactive instructional activity, students review attributes of equilateral polygons. They are introduced to the concept of a tessellation. Using protractors and pre-cut shapes, students arrange a variety of tiles to create...
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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

Designing a Fort

For Teachers 6th - 7th
Students explore the concept of right triangles. In this right triangle lesson, students construct a scale model of a tourist attraction similar to Fort Jefferson. Students research aerial photos of Fort Jefferson, then build their...

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