Worksheet
Curated OER

Classify Triangles

For Students 4th - 7th
Here is a classifying triangles practice worksheet in which learners sharpen their problem solving skills as they solve six story problems.
Lesson Plan
Curated OER

Angle Action

For Teachers 5th - 7th
Students measure and label specified angles. In this angles lesson, students use a protractor to find angles that are acute, obtuse, and reflexive. Students then label each angle and match the angles the correct definition. This lesson...
App
1
1
WeTransfer BV

Paper by FiftyThree

For Teachers 3rd - 12th
There is no such thing as someone who is not artistic when using this app. In fact, this is the type of app that makes you want to go out and buy a tablet computer. Whether you have a creative lesson planned, or just need a place to take...
Worksheet
Curated OER

Classify Angles Worksheet

For Students 5th - 6th
In this angle classification worksheet, students solve 8 problems in which an angle measurement in degrees is analyzed. Students classify each angle as right, obtuse, or acute.
Lesson Plan
Curated OER

Geometry Straws

For Teachers 3rd - 8th
Learners create different angles and shapes by using different lengths of straws. In this geometry straws lesson plan, students glue straws onto paper and define what they have made.
Worksheet
Curated OER

Classifying Triangles

For Students 6th
In this classifying triangles worksheet, 6th graders write the type of triangle, acute, right or obtuse, for 9 pictures of triangles, answers included.
Worksheet
Curated OER

Describe Five Polygons

For Students 6th - 9th
In this polygons worksheet, students use the parallel, acute, right, obtuse, straight, and reflex to describe the five shapes provided.
Worksheet
Curated OER

Identifying Triangles

For Students 5th - 7th
In this triangles practice learning exercise, students respond to 4 questions that require them to identify the pictured triangles as acute, right, or obtuse triangles.
Interactive
Curated OER

Have You Got The Angle?

For Students 5th - 6th
In this angle activity, students complete a set of 10 multiple choice questions. An answer link is provided; page is labeled as a "post test."
Worksheet
Curated OER

Identify Different Types of Angles

For Students 5th - 6th
In this angles worksheet, students identify a set of 4 given angles as either obtuse, acute, right or straight, checking the correct box next to each. A reference web site is given for additional activities.
Lesson Plan
Curated OER

Angles in Art Lesson

For Teachers 5th - 9th
Students examine the correlation between art and math. Using their computers, students construct and measure angles. Students identify the properties of angles and polygons. They engage in the Angles program on their Palm and use the...
Lesson Plan
Curated OER

Toothpick Triangles

For Teachers 4th - 8th
Students draw a chart (included in the lesson plan) to use with their investigation. They review terminology of triangles and receive toothpicks to use in the lesson plan. Beginning with three toothpicks, students form a triangle. They...
Worksheet
Curated OER

Identify Angles: Obtuse, Right, Straight and Acute

For Students 5th - 6th
In this triangle worksheet, students identify angles as either obtuse, right, straight or acute. A reference web site is given for additional activities.
Lesson Plan
Curated OER

Geometry and Measurement

For Teachers 6th - 8th
Students view a right triangle displayed by the teacher. Students measure legs and the interior angles of the triangle. They look for a pattern or relationship between the legs and angles. Students use pegboards and string to create more...
Worksheet
Curated OER

Triangles Word Search

For Students 5th - 6th
In this word search worksheet, students locate 7 types of triangles. Triangles include isosceles, acute, equilateral, right, and obtuse.
Worksheet
Curated OER

Independent Practice 2: Triangles

For Students 6th - 8th
In this triangle worksheet, students identify given triangles according to their sides and angles. Afterward, students draw triangles to match given descriptions. This one-page worksheet contains 15 problems.
Worksheet
Curated OER

Identify Angles: Acute, Right, Obtuse and Straight

For Students 5th - 6th
In this angles activity, learners identify a set of angles as either acute, right, obtuse or straight. A reference web site is given for additional activities.
Worksheet
Curated OER

Identify Triangles: Acute, Right, Obtuse, Straight

For Students 5th - 6th
In this triangles learning exercise, learners draw angles with given measurements and identify each as either acute, right, obtuse or straight. A reference web site is given for additional activities. 
Interactive1:45
Scholastic

Study Jams! Classify Triangles

For Students 5th - 8th Standards
Jam on with this multi-faceted activity teaching triangle classification. Start with a learner-paced lesson describing the different qualities of triangles and follow with a fun karaoke session. Also provided are two types...
Lesson Plan
Curated OER

Triangle Puzzler

For Teachers 5th - 8th
Students are introduced to some basic concepts of geometry. They explain that the definition of a triangle is a figure with three sides, three angles, and three points. Triangles can be named by using three points in their correct sequence.
Worksheet
Curated OER

Learning About Triangles

For Students 4th - 6th
Upper graders label four triangles and fill in the labels correctly. They draw three original triangles and answer the questions about them.
Unit Plan
PBS

Accessible Shapes

For Teachers 6th - 8th Standards
All the 2-D and 3-D measurement work you need is in one location. Divided into three sections, the geometry lesson plans consist of visualization of three dimensions, classifying geometric figures, and finding surface area and volume....
Lesson Plan
Curated OER

Picking Pythagoras

For Teachers 6th - 9th
Students discover that side measurement is used in determining angle classification of a triangle. By squaring sides, they predict whether triangles be right, obtuse, or acute. They prove the Pythagorean Theorem and use it to solve...
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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