# Protractor (Angle Meter)—Tool to measure degrees and radians for iPhone, iPod touch, and iPad (supports iPad mini and retina display)

## Review Overview

### 7

#### Protractor: A Best App for the Math Classroom

Summary : A digital protractor at your fingertips

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Protractor is designed to measure an angle’s degrees. With Protractor, users align the vertex with each ray that forms the angle. Once aligned, Protractor displays the interior and exterior degrees of the angle to the tenth decimal place.

### Instructional Ideas

1. Teachers can have students create different degrees of angles with this app to build their familiarity of how a protractor functions.
2. Students can draw different angles on a piece of paper and then cut out each angle. Next, students can measure the degree of the angles by placing them on their iPad’s screen, matching the vertices together, and matching the rays together. Finally, with this app, students would be able to measure the degree of the different angles.
3. To review angle types, teachers could have all their students in a class launch this app. Next, teachers could say the name of a type of angle (e.g., acute, obtuse, right, straight, etc.) and students would have to create that angle on their iPad using this app. While students are creating their angles, teachers could walk around the room and check their students’ work.
 A1. Rigor A2. 21st Century Skills A3. Conn. to Future Learning A4. Value of Errors A5. Feedback to Teacher A6. Level of Material A7. Cooperative Learning A8. Accom. of Individual Diff.
 B1. Ability to Save Progress B2. Platform Integration B3. Screen Design B4. Ease of Use B5. Navigation B6. Goal Orientation B7. Information Presentation B8. Media Integration B9. Cultural Sensitivity
 C1. Learner Control C2. Interactivity C3. Pace C4. Flexibility C5. Interest C6. Aesthetics C7. Utility