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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 of...
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PPT
Curated OER

Classifying Triangles

For Teachers 5th - 7th
This presentation shows how triangles are classified by angle measurement and length of sides.  It reviews isosceles, scalene, obtuse, right, and acute classifications and includes questions for students to classify some of the triangles...
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Lesson Plan
Curated OER

Classify and Measure the Angles

For Teachers 5th - 7th
In this measuring angles worksheet, students use protractors to measure 9 angles and classify them as obtuse, straight, acute or right angles.
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Worksheet
Curated OER

Identifying Angles

For Students 5th - 8th
In this angles practice instructional activity, students respond to 4 questions that require them to identify the pictured angles as acute, right, or obtuse angles.
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Worksheet
Math Mammoth

Classify The Triangles

For Students 6th - 8th
In this math activity, students measure all the angles in these triangles. They also calculate the sum of the angles and classify the triangles.
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Worksheet
Curated OER

Angle Measures

For Students 5th - 6th
In this angles worksheet, students solve 20 problems pertaining to angle measurement and classification. This page is intended to be an online activity, but can be completed on paper.
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Lesson Plan
Curated OER

Forming, Measuring and Labeling Angles

For Teachers 4th - 6th
Pupils draw and measure angles. For this angle measurement lesson, the teacher demonstrates how to form and measure angles while explaining the parts of an angle, then students practice.
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Worksheet
Curated OER

Classifying Triangles

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

Classify and Measure the angles

For Students 5th - 8th
In this angles worksheet, students measure and classify angles with a protractor. Students complete the measurement of 9 angles.
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Interactive2:10
Scholastic

Study Jams! Classify Quadrilaterals

For Students 3rd - 6th Standards
Face the vertex of two-dimensional shapes and discover what each figure requires as part of its classification. With one shape per slide, learners see what makes each shape special and compare it to others with similar qualities. 
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Worksheet
Curated OER

Angles Measure and Classify

For Students 5th - 6th
In this angles worksheet, students solve 6 problems in which an angle is measured with a protractor. Students mark if the angle is acute, right, obtuse or straight.
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Worksheet
Curated OER

Angles measure and classify

For Students 5th - 8th
For this angles worksheet, learners measure angles with a protractor and figure out if it is acute, right, obtuse, or straight. Students complete 6 problems.
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Lesson Plan
Curated OER

Measuring Angles

For Teachers 6th
Sixth graders identify and measure right, acute, obtuse, and straight angles. In this geometry lesson, 6th graders review the definition of each angle and are shown examples of each specific angle. Students use toothpicks, gumdrops, and...
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Worksheet
Curated OER

Angles

For Students 4th - 6th
In this angles worksheet, students classify and measure a set of 12 angles. An answer key is included A website reference is given for additional resources.
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Worksheet
Curated OER

Angles

For Students 4th - 6th
In this angles worksheet, students classify and measure a set of 12 angles. A website reference for additional activities is given.
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Handout
McGraw Hill

Triangles

For Students 4th - 7th Standards
After reviewing characteristics of seven types of triangles, young geometers discover how to find the missing angle of a triangle. Then, they practice identifying triangles, find missing angles, and find missing side lengths of similar...
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Worksheet
Curated OER

Constructions and Angles

For Students 6th - 10th
For 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...
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Lesson Plan
Curated OER

Angle Action

For Teachers 6th
Sixth graders investigate the concept of an angle. They classify an angle according to its type. The lesson has students practice with acute, right, and obtuse angles. A unique part is when telling time using clock hands is related to...
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Worksheet
Curated OER

Quadrilaterals and Angle Sums: Reteach

For Students 5th - 6th
In this quadrilateral and angle sum worksheet, students review the five types of quadrilaterals. Students then find each missing angle measure and classify the figures as quadrilateral, parallelogram, rectangle, rhombus, square, or...
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Worksheet
Curated OER

Triangle Designs

For Students 4th - 6th
In this triangles worksheet, students draw different triangles and write how many sides and angles each one has. Students draw 4 kinds of triangles and have 2 that are impossible to draw.
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Lesson Plan
Curated OER

Measurement: The Size is Right

For Teachers Pre-K - 8th
Specific learning goals are grouped for different grade levels spanning pre-kindergarten to eighth grade. After preparing the questions and materials, you call a learner to come in front of the class and play the game. Young learners...
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Worksheet
Curated OER

Naming Angles

For Students 5th - 7th
For this geometry worksheet, students solve 6 problems in which an angle is analyzed. From 5 choices, students circle the correct math symbol that names the angle. There are no examples or explanations for the symbols, which would be...
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Lesson Plan
National Security Agency

Classifying Triangles

For Teachers 4th - 8th Standards
Building on young mathematicians' prior knowledge of three-sided shapes, this lesson series explores the defining characteristics of different types of triangles. Starting with a shared reading of the children's book The Greedy Triangle,...
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Worksheet
Curated OER

Classify and Measure Angles

For Students 4th - 6th
In this angles activity, students classify and measure a set of 9 angles, using a protractor. A reference web site is given for additional activities.

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