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Properties Of Straight Lines

Soumi R.
15/06/2017 0 1

1. Line segment: A line segment has two end points with a definite length.

2. Ray: A ray has one end point and infinitely extends in one direction.

3. Straight line: A straight line has neither starting nor end point and is of infinite length.

4. Acute angle: The angle that is between 0° and 90° is an acute angle.

5. Obtuse angle: The angle that is between 90° and 180° is an obtuse angle.

6. Right angle: The angle that is 90° is a Right angle.

7. Straight angle: The angle that is 180° is a straight angle.

8. Supplementary angles: If the sum of two angles is 180° then the angles are called supplementary angles. Two right angles always supplement each other. The pair of adjacent angles whose sum is a straight angle is called a linear pair.

9.Complementary angles: If the sum of two angles is 90° then the two angles are called complementary angles.

10. Adjacent angles: The angles that have a common arm and a common vertex are called adjacent angles.

11. Vertically opposite angles: When two lines intersect, the angles formed opposite to each other at the point of intersection (vertex) are called vertically opposite angles.

                                           opposite angles

12. Perpendicular lines: When there is a right angle between two lines, the lines are said to be perpendicular to each other.

13. Parallel lines: The line is called a transversal, that which intersects two or more lines (not necessarily parallel lines) at distinct points.

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Padmini R. | 15/06/2017

It is very much helpful. One can find all definitions related to properties of straight lines.

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