Some Geometric Terms and Results
Some geometric terms and results used in terms of words.
Some Geometric Terms and Results:
• The sum of all the angles at a point is 360°.
i.e., ∠1 + ∠2 + ∠3 + ∠4 + ∠5 + ∠6 = 360°
• The sum of all the angles about a point on a straight line on one side of if it is 180°.
i.e., ∠1 + ∠2 + ∠3 + ∠4 = 360°
Some Important Geometric Terms Used:
1. Equal angles:
Two angles are said to be equal if they have the same degree measure. ∠MNO and ∠XYZ are equal angles of measure 90°.
2. Bisector of an Angle:
The ray which divides the given angle into two equal angles is called an angle bisector.
In the adjoining figure, the ray BD divides ∠ABC into two equal angles ∠ABD and ∠DBC
i.e., ∠ABD = ∠DBC.
Perpendicular Lines:
Two lines in a plane are said to be perpendicular if they intersect in such a way that the angles formed between them are right angles. In the adjoining e, lines PQ and RS intersect at 0 such that ∠ROQ = ∠ ROP = ∠POS = ∠QOS = 90°.
Therefore, we say that PQ is perpendicular to RS, i.e., (PQ ⊥ RS).
Perpendicular Bisector:
It is the line which passes through the midpoint of the given line segment and is also perpendicular to it. Here, MN is the line segment. PQ is the perpendicular bisector as ∠POM = ∠PON = 90° and MO = ON.
Some geometric terms and results are explained along with the specific figure.
● Lines and Angles
Fundamental Geometrical Concepts
Some Geometric Terms and Results
Complementary and Supplementary Angles
Parallel and Transversal Lines
8th Grade Math Practice
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