Houghton Mifflin Harcourt
Lines, Line Segments, Rays, and Angles - Practice 15.1
Is it a line, line segment, ray, or angle? Identifying geometric figures is the focus. In addition to identification, learners recognize right angles or tell if an angle is less than or greater than a right angle. They tell if lines are...
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Classifying Triangles
In this classifying triangles learning exercise, students explore given lengths or angle measurements and then classify each triangle as isosceles, scalene or equilateral. They also determine if the triangle may be right, acute or...
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Identifying Angles
Third graders analyze angles and determine if they are acute, right, or obtuse. In this angles lesson plan, 3rd graders study the definition and characteristics of each angle. Students then do a worksheet to identify the name of the angle.
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Square Corners
Are these angles greater than, less than, or equal to a square corner? Using a visual guide, young geometers label 16 angles into one of these three categories. Use this before introducing the terms acute, obtuse, and right...
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Angles Lesson 15-2
The four major types of angles, right, obtuse, acute, and straight are described in this fine presentation. First, the important vocabulary associated with angles is presented, then the types of angles are described. A protractor is...
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Angles ~ Right Angles
Have your class review how to identify right angles. Learners identify right angles, and then write the number of angles found in each shape.
Illustrative Mathematics
The Geometry of Letters
Use the alphabet as a tool for teaching your class about geometric figures. Break apart capital letters into line segments and arcs. Classify angles as right, acute, or obtuse. Identify parallel and perpendicular lines. An excellent...
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Identify the angles - acute, right, obtuse, and straight
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.
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Obtuse Triangles
Fourth graders explore obtuse triangles. In this geometry instructional activity, 4th graders make obtuse triangles with paper and scissors. They determine how to find the center of their triangle.
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Angle Comparison to Right Angles
In this angles worksheet, students solve 4 problems in which an angle is analyzed and measured. Students tell if each angle is greater than, less than or equal to a right angle.
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Right Triangles
For this right triangles worksheet, 10th graders solve and complete 12 different types of problems. First, they solve for a variable given each of the right triangles with the sides as indicated. Then, students determine the shorter...
Pennsylvania Department of Education
Kites: On the Right Track
Students use the Pythagorean theorem to discover the relationships between the lengths of sides of a right triangle. In this right triangles lesson plan, students use their reasoning and mathematical skills.
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Angles - Digger and the Gang
Students explore angle estimation and measurement. In this angle lesson, students define obtuse, acute, and right angles, and practice measuring angles using a protractor. Students participate in an online angle estimation activity.
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Making an Angle Eater
Third graders create angle eaters where they use circles with cut outs to identify right, obtuse, and acute angles. Students complete 1 angle eater.
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Three Ways to Name an Angle
Learners first name angles in three ways, then classify them as acute, obtuse or right angles. Good practice when introducing the concept of different types of angles.
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Countdown Challenge: Geometry Exploration
In this geometry worksheet, students identify and draw right angles, acute angles, obtuse angles and straight angles. This one-page worksheet contains 34 problems.
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Measuring Angles
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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Hey! What Is Your Angle?
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!
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Angle Action
Sixth graders investigate the concept of an angle. They classify an angle according to its type. The instructional activity has students practice with acute, right, and obtuse angles. A unique part is when telling time using clock hands...
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Measure the Angle
Students measure angles. In this angle lesson plan, students draw angles. They use a protractor to measure angles and identify the angle as straight, right, acute, or obtuse.
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Acute, Right or Obtuse
In this angles worksheet, students solve 4 problems in which angles are analyzed and classified as acute, obtuse, or right. No examples are provided.
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What's Your Angle
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...
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Mr. Bo Jangle, What's Your Angle?
Third graders explore angles. In this geometry lesson plan, 3rd graders identify and define acute, obtuse, and right angles. Students form angles with their bodies, find angles in picture books, and record angles found outside in their...
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Pythagorean Theorem
In this Pythagorean theorem worksheet, 9th graders solve and complete 6 various types of problems. First, they find the length of a right-angled triangle's hypotenuse. Then, students determine which triangle is described and explain...