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Geometry Vocabulary

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Geometry Vocabulary

1. 1. Isabel Rivera Galicia
2. 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. 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. 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. 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. 6. Lines that are on the same plane, but that never intersect (cross). PARALLEL LINES s r
7. 7. Lines that intersect (cross) INTERSECTING LINES
8. 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. 9. Angles can be measured in degrees. The symbol for degrees is a small raised circle °
10. 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. 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. 12. Acute angles measure less than 90° ACUTE ANGLE
13. 13. An obtuse angle measures more than 90° but less than 180° OBTUSE ANGLE
14. 14. Two lines are called perpendicular lines if they intersect to form a right angle. PERPENDICULAR LINES
15. 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. 16. Two angles are called supplementary angles if the sum of their measures is 180° SUPPLEMENTARY ANGLES
17. 17. If two figures are identical in both shape and size then they are congruent CONGRUENT FIGURES
18. 18. If two figures have the same shape but different sizes then they are similar SIMILAR FIGURES