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- 1. Isabel Rivera Galicia
- 2. A point can be described as a location in space. Represented by a dot and is named by writing a capital letter next to the dot. POINT
- 3. LINE A line is a straight row of points that goes on forever in both directions. A line is named by a minuscule letter r s
- 4. TYPES OF LINES •Broken Line: we combine various segments in zigzag •Wavy Line: we combine semicircular arcs together •Mixed Line: we combine straight and curve lines
- 5. A line segment is a piece of a line that has two endpoints. It is named for its endpoints. The segment with endpoints A and B shown to the right is named: SEGMENT
- 6. Lines that are on the same plane, but that never intersect (cross). PARALLEL LINES s r
- 7. Lines that intersect (cross) INTERSECTING LINES
- 8. An angle is made up of two lines that start at a common endpoint. The common endpoint is called the vertex. Named: ANGLE
- 9. Angles can be measured in degrees. The symbol for degrees is a small raised circle °
- 10. Acute angles – measure less than 90° Right angles – measure exactly 90° Obtuse angles measure more than 90° but less than 180° Straight angles measure exactly 180° CLASSIFYING ANGLES
- 11. An angle of 90° is called a right angle. To show that an angle is a right angle, we draw a small square at the vertex. RIGHT ANGLE
- 12. Acute angles measure less than 90° ACUTE ANGLE
- 13. An obtuse angle measures more than 90° but less than 180° OBTUSE ANGLE
- 14. Two lines are called perpendicular lines if they intersect to form a right angle. PERPENDICULAR LINES
- 15. Two angles are called complementary angles if the sum of their measures is 90°. If two angles are complementary , each angle is the complement of the other. COMPLEMENTARY ANGLES
- 16. Two angles are called supplementary angles if the sum of their measures is 180° SUPPLEMENTARY ANGLES
- 17. If two figures are identical in both shape and size then they are congruent CONGRUENT FIGURES
- 18. If two figures have the same shape but different sizes then they are similar SIMILAR FIGURES

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