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Lesson Plan
Houghton Mifflin Harcourt

Introducing the Concept: Triangles and Quadrilaterals

For Teachers 5th - 7th Standards
Guide your geometers through the process of constructing polygons. They learn how to draw triangles, squares, parallelograms, rectangles, rhombuses, and trapezoids with specified angles using a protractor and a ruler. The lesson plan...
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Interactive
Curated OER

My Test Book: Geometry

For Students 3rd - 4th
In this online interactive math skills worksheet, students solve 10 multiple choice math problems regarding geometry skills. Students may view the correct answers.
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Lesson Plan
Curated OER

Isosceles Triangles

For Teachers K - 2nd
Students investigate triangles. In this shapes geometry lesson plan, students define and state the attributes for equilateral, scalene, and isosceles triangles. Students locate the prefix "tri" in a variety of words and make connections...
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Lesson Plan
Curated OER

Identifying Triangles

For Teachers 6th
Sixth graders identify and define a variety of triangles. In this identification of triangles instructional activity, 6th graders draw examples of each triangle on a whiteboard, then complete a worksheet.
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Lesson Plan
Curated OER

Geoboard Ideas

For Teachers 3rd - 4th
Students build polygons on their geoboards. In this geometry lesson plan, students build and then draw it on paper and label it. Students then switch with a partner to try an make a symmetrical shape.
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Lesson Plan
Curated OER

Exploring Altitudes in Math

For Teachers 6th - 12th
Students draw and calculate altitudes. They draw the altitude of acute, right and obtuse triangles and calculate the altitude of a triangle using the Pythagorean theorem.
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Lesson Plan
Curated OER

Got Milk?

For Teachers 6th - 8th
Students measure the angles of a milk carton. They identify and label acute, right, and obtuse angles. Using appropriate tools, students determine the volume of a cube or a rectangular prism. Students complete worksheets to...
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Worksheet
Curated OER

Identify Triangles

For Students 5th - 6th
In this triangle activity, learners 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 instructional activity, 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

Extending Trigonometry Skills

For Students 10th - 12th
In this trigonometry worksheet, learners use the sine and cosine law to solve problems. They investigate obtuse triangles using these laws. There are 40 questions.
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Worksheet
Raytheon

Understanding Triangles

For Students 6th - 8th
In this understanding triangles worksheet, learners read 6 pages of examples and explanations about identifying triangles, determining length of sides and degrees of angles, including the hypotenuse, then answer 28 questions, answers...
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Lesson Plan
Curated OER

The Pythagorean Theorem

For Teachers 10th
In this geometry worksheet, 10th graders apply the Pythagorean Theorem as they determine the length of the missing leg or hypotenuse in right triangles.  The one page worksheet contains twelve questions.  Answers are...
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Worksheet
Curated OER

Geometry Vocabulary

For Students 10th
In this geometry vocabulary worksheet, 10th graders are given different angles with different names. They must match the correct angle with the correct name. There are 45 questions dealing with angles, there is an answer key.
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Lesson Planet Article
Curated OER

Lesson Plans that Measure Up

For Teachers 3rd - 6th
You can use creative ways to teach angle lessons that will meet the needs of all students.
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Lesson Plan
Curated OER

Geometry Regents Questions: Isosceles Triangle Theorem

For Teachers 9th - 12th
In this isosceles triangle worksheet, students solve 19 multiple choice and short answer problems.  Students use the isosceles triangle theorem to determine unknown angle measures.
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Lesson Plan
Curated OER

Special Segments of Triangles Jigsaw Activity

For Teachers 11th - 12th
Students identify the special segments of triangles, the median, angle bisector, altitude, and perpendicular bisectors.
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Worksheet
Curated OER

Geometry Course Review

For Students 10th
For this geometry review set of worksheet, 10th graders solve and complete 139 various types of problems. First, they find the slope-intercept form of a line passing through a point and parallel to a line given. Then, students find the...
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Worksheet
Curated OER

Identify Triangles #2

For Students 5th - 6th
For this triangle worksheet, 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 learning exercise, students identify triangles as either Acute, right or obtuse. A reference web site is given for additional activities.
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Worksheet
Curated OER

Identifying Types of Triangles

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

Triangles

For Students 3rd - 4th
In this triangles worksheet, learners identify 3 triangles by the length of their sides and 3 triangles according to their internal angles.
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Lesson Plan
Curated OER

Types of Triangles

For Teachers 1st - 2nd
Learners classify triangles by the length of their sides. In this geometry activity, students use a white board to demonstrate the angles of various triangles. Learners construct an equilateral, isosceles, and a scalene triangle.
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Lesson Plan
Curated OER

2-D Geometry

For Teachers 3rd
Third graders describe and compare attributes of two-dimensional shapes. They explain geometric terms, angles and shapes. Students demonstrate each vocabulary word with their body and they mirror the body positions associated with each...
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Lesson Plan
Curated OER

Pythagorean Theorem

For Teachers 7th - 10th
Students find the different ratios of a triangle. In this geometry lesson, students use the Pythagorean Theorem to solve for missing sides and angles on a right triangle. They use a robot to create a right triangle.

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