Angle Measurement Lesson 2 b next Definitions I

Angle Measurement Lesson 2 b next

Definitions: I. A • B Ray A. B. C. D. A ray is the part of a line consisting of one endpoint and all the points of the line on one side of the endpoint. A ray goes on forever in one direction without ending. A ray is named by first stating the endpoint and then one other point in the direction of the ray. For example, the ray above could be named-Ray AB or AB next

C • Definitions Cont. A • B II. Angle A. An angle is formed by two rays with the same endpoint. B. The two rays are called the sides of the angle. C. The common endpoint is called the vertex. next

C • Definitions Cont. A next • B II. Angle cont. . . D. An angle is named a few different ways: For our purposes we will most often use three points to name an angle. E. For example, the angle above could be named: BAC. When naming an angle: 1) The middle letter is always the vertex. 2) The first letter is one point on one of the rays. 3) The last letter is one point on the other ray.

C • Definitions Cont. III. Congruence A. A • B Figures that have the same size & same shape are congruent ( ). B. Segments are congruent if they are the same length. C. Angles are congruent if they are the same degree measure. D. ROC is congruent to XYZ. This can be written, ROC XYZ. X • R • 48º Y • • O • • C next Z

Angle Measurement: next I. Angles are measured using units called degrees. A. The symbol for degree is a small raised zero (°). B. We use a protractor to measure angles. Protractor 40°

next Angle Measurement cont… II. Angles can be classified according to their measure.

next Angle Measurement cont… Acute Angle: Types of Angles: Angles less than 90° are called Acute Angles. Right Angle: Obtuse Angle: Angles greater than 90° are called Obtuse Angles. Straight Angle: Symbol for right angle 180° Angles equal to 90° are called Right Angles equal to 180° are called Straight Angles.

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Choose the correct measure. 160° or 20° Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. 20° That’s Correct! 20° Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Click here to review Angle Types 20° How would you classify this angle? Choose one! Acute Obtuse Right Straight Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Angles less than 90° are called Acute Angles. Click here to review Angle Types 20° That’s Correct! Acute Next Angle

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Choose the correct measure. 130° or 50° Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. 130° That’s Correct! 130° Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Click here to review Angle Types 130° How would you classify this angle? Choose one! Acute Obtuse Right Straight Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Angles greater than 90° are called Obtuse Angles. Click here to review Angle Types 130° That’s Correct! Obtuse Next Angle

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Choose the correct measure. 118° 60° 62° 78° Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. 62° That’s Correct! 62° Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Click here to review Angle Types 62° How would you classify this angle? Choose one! Acute Obtuse Right Straight Next Angle

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Angles less than 90° are called Acute Angles. Click here to review Angle Types 62° That’s Correct! Acute Next Angle

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Choose the correct measure. 180° 90° 0° 110° Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. 90° That’s Correct! 90° Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Click here to review Angle Types 90° How would you classify this angle? Choose one! Acute Obtuse Right Straight Next

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Angles equal to 90° are called Right Angles. Click here to review Angle Types 90° That’s Correct! Right Next

Angle Measurement cont… Back Acute Angle: Types of Angles: Angles less than 90° are called Acute Angles. Right Angle: Obtuse Angle: Angles greater than 90° are called Obtuse Angles. Straight Angle: Symbol for right angle 180° Angles equal to 90° are called Right Angles equal to 180° are called Straight Angles.

Angle Measurement cont… Click on the protractor to measure each angle, then classify the angle as acute, right, obtuse, or straight. Sorry Try Again! Back