NASA
Measuring Solar Energy During an Eclipse
Don't leave your classes in the dark! An inquiry-based lesson has young researchers analyze the light intensity before, during, and after a solar eclipse. They use their data to make inferences about the solar energy available during...
McGraw Hill
Triangles
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...
Savvas Learning
Saxon Math 5/4
You'll never have to search for another worksheet again after downloading this extensive collection of Saxon math materials. With over 600 pages of example problems and skills practice exercises, this is a must-have resource...
Virginia Department of Education
Classifying Angles
Don't be obtuse, this geometry unit is the just the right resource for educating the acute young minds in your class. From classifying and measuring angles, to determining the congruence of shapes, this...
Illustrative Mathematics
Finding an Unknown Angle
Teach your class how to apply their knowledge of geometry as they explore the unknown. In order to find an unknown angle, students must understand that rectangles have four interior right angles, that right angles have 90 degrees, and...
Houghton Mifflin Harcourt
Angle Pairs - Reteach 14.2
Practice recognizing types of additive angles with a worksheet in which pupils review adjacent, interior and exterior, complementary, and supplementary angles and use a diagram to give examples of them. Be aware that the diagram involves...
Houghton Mifflin Harcourt
Leveled Problem Solving: Angles
This splendid assignment gets future engineers to compute complementary or supplementary angles in real-life applications! Once they have mastered the art of additive angles, they can apply their knowledge to help Steve, Inez, Carlotta,...
Curated OER
Supplementary, Complementary, and Vertical Angles
By using circles that they cut out and label themselves, learners literally "get a grip" on the angles they identify: supplementary, complementary, and vertical. They solve missing measurements based on properties of supplementary,...
Curated OER
Missing Measures: Complimentary and Supplementary Angles
A missing measure mystery! Right angles and straight angles are divided in two, with the measure of one side provided. Angle analyzers compute the value of the missing complimentary or supplementary angle. There are eight problems for...
Curated OER
No Foot, No Horse
Why do horses wear shoes? Why do people wear shoes? Using worksheets, which are embedded in the plan, learners write descriptive paragraphs about their own shoes, classify a pile of shoes, and also engage in math games about the variety...
K6 Math
Complementary and Supplementary Angles #1
Learners are given one angle measure, and then determine the corresponding supplementary or complementary angle. A reference web site is given for additional activities. This assignement can be adapted to demonstrate that angle measure...
Curated OER
Working Watermelon
You're going to wish you had a watermelon for this lesson! Class members read about watermelons and make a salad in class to sample. They also perform estimates, measurements and calculations on a watermelon. They predict what percentage...
Curated OER
Piece by Piece
What do your pupils know about quilting? Read and discuss the information included here before sending class members off to create their own quilt blocks using construction paper. When they have completed their blocks, provide some time...
PBS
Pbs Learning Media: What's a 360?
In this Cyberchase video segment, Harry tries to snowboard and learns how to measure and identify many common angles.
Shodor Education Foundation
Shodor Interactivate: Lesson: Angles (Elementary)
In this lesson students will learn what determines whether an angle is acute, obtuse or a right angle.
Math Playground
Math Playground: Estimate the Angle
Practice estimating the angle by sliding the blue "X" button up and down to open and close the angle. See how many aliens you can zap with the correct answer. Your total correct out of 10 is listed just below the problem.
Government of Alberta
Learn alberta.ca: Mathematics Glossary: Acute Angle
Get a visual and animated definition of what an acute angle is, as well as examples of acute angles in the real world.
Government of Alberta
Learn alberta.ca: Mathematics Glossary: Angle
Get a visual and animated definition of the term "angle" from LearnAlberta.ca's Mathematics Glossary.
Math.com
Math.com: Building Blocks: Classifying Angles
This geometry resource investigates types of angles. Definitions, detailed examples, and practice problems are included.
PBS
Pbs Learning Media: Directions to Hen Rock
The CyberSquad has to deal with angles and distances to locate a treasure chest in this video segment from Cyberchase.
Shodor Education Foundation
Shodor Interactivate: Lesson: Angles
This upper elementary and middle school lesson plan introduces the concept of acute, obtuse and right angles. Also, as the lesson proceeds vertical, adjacent, alternate interior and alternate exterior angles are explored. Plenty of...
Mr. Martini's Classroom
Mr. Martini's Classroom: Geometry Special Angle Pairs and Parallel Transversals
Students are challenged to identify and measure angles created by parallel lines and a transversal as well as complementary and supplementary pairs.
CK-12 Foundation
Ck 12: Elem Math: Classifying Right Obtuse or Acute by Angle Measure
[Free Registration/Login may be required to access all resource tools.] Students watch a video and attempt practice problems on how to classify triangles based on angle measures.
Math Is Fun
Math Is Fun: Angles
Definitions of different types of angles along with images and an interactive tool through which you can create acute, right, straight, obtuse, and reflex angles. View the parts of an angle, and learn the proper way to label angles.