Lesson Plan
EngageNY

Angle Sum of a Triangle

For Students 8th Standards
Prove the Angle Sum Theorem of a triangle using parallel line and transversal angle relationships. Pupils create a triangle from parallel lines and transversals. They find angle measures to show that the angles of a triangle must total...
Lesson Plan
Curated OER

Hey! What Is Your Angle?

For Teachers 5th
Fifth graders create and classify straight, right, acute and obtuse angles. In this clever lesson, 5th graders utilize pretzel sticks to form different types of angles. Best of all, they get to eat them at the end!
Worksheet
Curated OER

Exploring Angles

For Students 10th
In this exploring angles instructional activity, 10th graders solve 6 various problems of geometry by identifying various types of angles. First, they use the figure shown to list all the angles that have W as the vertex and then, name...
Lesson Plan
Curated OER

What's Your Angle

For Teachers 6th - 7th
In this angle worksheet, students identify five shapes and then place them together to form a square. Afterward, they answer three questions regarding the number of right, acute and obtuse angles. This one-page worksheet contains a total...
Worksheet
Curated OER

Angles

For Students 10th
In this angles worksheet, 10th graders measure 10 different types of angles described in each problem. First, they determine whether two congruent angles form a supplementary figure. Then, students determine the degrees in an angle when...
Lesson Planet Article
Curated OER

Measuring Angles

For Teachers 3rd - 5th
Identifying and measuring angles with a protractor can provide a fun way for students to learn this mathematical concept.
Worksheet
Curated OER

Constructions and Angles

For Students 6th - 10th
In this triangle constructing and classifying worksheet, learners 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"...
Worksheet
Curated OER

Naming Angles

For Students 3rd - 5th
In this naming angles worksheet, students name each angle shown as an acute, obtuse or right angle, 12 angles total. Answers included on page 2.
Lesson Plan
Curated OER

Sorting Angles

For Teachers 4th - 7th
In this sorting angles worksheet, students distinguish the differences between right, obtuse and acute angles. Students determine what type of angle thirteen angles are as shown.
Worksheet
Curated OER

Countdown Challenge: Geometry Exploration

For Students 6th - 8th
In this geometry worksheet, students identify and draw right angles, acute angles, obtuse angles and straight angles. This one-page worksheet contains 34 problems.
Interactive
Curated OER

Types of Angles

For Students 9th - 12th
In this online math worksheet, high schoolers perform calculations which allow them to identify 3 types of angles. This excellent resource allows the students to check their answers, and to get "hints" should they run into difficulties....
Worksheet
Curated OER

Easy Worksheet: Classify the Triangle

For Students 9th - 12th
In this classify the triangle worksheet, students solve 6 short answer problems. Students identify the type of triangle being described according to its angle measures and side lengths.
Interactive
CK-12 Foundation

Pythagorean Theorem to Classify Triangles: Missing Angles

For Students 8th - 12th Standards
Learn to use the Pythagorean Theorem with non-right triangles. Pupils use the interactive to discover the relationship between the lengths of sides for acute and obtuse triangles. They compare the squares of the sides of the triangles to...
Handout
Charleston School District

The Sum of Angles in a Triangle

For Students 8th Standards
An informative lesson contains a brief explanation of how the sum of the angles of a triangle is a line. The lesson continues with determining the missing angle in a triangle, or solving for a variable. Using the sum of the...
Worksheet
Kuta Software

Classifying Angles

For Students 6th - 10th Standards
Learners sharpen their classification of angles skill with a simple angles worksheet that starts with unlabeled angles and ends with specific angle measures to classify.
PPT
Curated OER

Classifying Triangles

For Teachers 3rd - 5th
If you're looking for a presentation to assist you in your teaching of triangles, this one could be for you. In it, learners are shown how triangles are classified by the size of their angles and by their sides. These are tricky concepts...
Lesson Plan
Curated OER

Working With Angles

For Teachers 4th - 5th
In this math worksheet, students collaborate with a "study buddy" or "coach" to learn whether an angle is acute, obtuse or right. Students follow the directions to go through the process of deciding what classification an angle has....
Worksheet
Curated OER

Identify the angles - acute, right, obtuse, and straight

For Students 6th - 10th
In this angles worksheet, students draw the angles described to them and then decide whether it is an acute, right, obtuse, or straight angle. Students complete 4 problems.
Worksheet
Curated OER

Identify the Angles

For Students 5th - 7th
In this angle review worksheet, students examine 4 angles and identify each of them as acute, right, obtuse, or straight angles.
Lesson Plan
Curated OER

What's Your Angle?

For Teachers 3rd
Third graders read the story, Magic Schoolbus Inside the Human Body. Then they form right, acute, and obtuse angles using the joints inside their bodies. They write a brief summary about what they learned about angles as a review the...
Lesson Plan
Curated OER

Symmetry in Paper Airplanes

For Teachers 5th - 8th
Students explore symmetry.  In this geometry and scientific inquiry lesson, students design paper airplanes with middle line symmetry, as well as right, obtuse, and acute angles.  Students measure the plane's angles using a...
Worksheet
Curated OER

How Do We Measure Angles

For Students 4th - 5th
In these angles and geometry worksheets, learners learn about different kinds of angles, angle measurement, and other geometry facts. Students complete 15 questions.
Worksheet
Curated OER

Acute or Obtuse Angles

For Students 6th - 7th
In this geometry worksheet, students view ten angles of varying degrees and identify if the angle is acute or obtuse. The students write the answer on the lines provided.s
Lesson Plan
Curated OER

Angle Exploration and Classification

For Teachers 4th - 7th
Students compare and contrast angles and identify them as acute, obtuse, right, or straight angles. They create rays and angles using uncooked spaghetti, read and discuss key vocabulary terms, and complete a variety of geometry worksheets.

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