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Angles (elementary)
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Abstract
Students learn about classifying angles by their measure and in relation to angles formed by two lines crossed by a transversal.Objectives
Upon completion of this lesson, students will:
- have learned the difference between acute, obtuse, and right angles
- have learned how to classify angles formed by two lines crossed by a transversal
Standards Addressed:
Student Prerequisites
- Technological: Students must be able to:
- perform basic mouse manipulations such as point, click and drag
- use a browser for experimenting with the activities
Teacher Preparation
Students will need: - access to a browser
- construction paper and pencil
- rulers and scissors
Key Terms
| acute angle | An angle whose measure is less than 90 degrees |
| adjacent angles | Two angles that share a ray, thereby being directly next to each other |
| alternate exterior angles | Angles located outside a set of parallel lines and on opposite sides of the transversal |
| alternate interior angles | Angles located inside a set of parallel lines and on opposite sides of the transversal |
| obtuse angle | An angle whose measure is greater than 90 degrees |
| parallel | Lines that are in the same plane that do not intersect |
| right angle | An angle of 90 degrees |
| transversal | A line or ray that divides other lines or rays |
| vertical angles | The two nonadjacent angles formed when two straight lines intersect |
- Focus and Review
Review any previously learned information regarding angles.
- Objectives
Students will identify different types of angles including:- adjacent
- alternate exterior
- alternate interior
- verticle
- acute
- obtuse
- right
- Teacher Input
Explain the rules to the What's Your Angle? game.
- Guided Practice
Have the students play the What's Your Angle? game.
- Independent Practice
- Tell the students to open the Angles Applet.
- Have the students complete at least 10 computer generated problems from the Angles Applet.
- Instruct the students to copy down the angles given to them by the computer along with the correct answer to the computer generated questions.
- Closure
Review the different types of angles by having the students come to the front of the class and point out the different angles on the floor angle model.
