1. To identify straight, right, obtuse, and acute angles.

2. Have students multiply and add. 1. (2x3) + (1x9) = 2. (4x5) + (5x2) = 3. (8x3) + (6x2) = 4. (6x1) + (7x5) = 5. (5x3) + (5x3) =

3. The clock hands suggest an angle. Is the angle straight, right, obtuse, or acute? An angle is formed by two rays with a common endpoint. The common endpoint is called the vertex. An angle is usually named by 3 points, the vertex and one on each day. We say: angle ABC We write: ABC on the clock hands.

4. A C B Notice,in naming an angle, the vertex is always named as the center letter.

5.  Angles are measured in degrees. So we say, 180 degrees. We write: 180°

6. STRAIGHT ANGLE 180° RIGHT ANGLE 90°

7. OBTUSE ANGLE Greater than 90° less than 180° ACUTE ANGLE Less than 90°

8.  What kind of angle does the clock hands suggest? The clock hands suggest a ________ angle. LET’S PRACTICE !