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°

sum of all angles

• 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°

Important Geometric Terms

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°.

equal angles

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.

bisector of an angle

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 lines

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.

perpendicular bisector

Some geometric terms and results are explained along with the specific figure.

Lines and Angles

  • Fundamental Geometrical Concepts
  • Basic Geometrical Concepts
  • Angles
  • Classification of Angles
  • Related Angles
  • Some Geometric Terms and Results
  • Complementary Angles
  • Supplementary Angles
  • Complementary and Supplementary Angles
  • Adjacent Angles
  • Linear Pair of Angles
  • Vertically Opposite Angles
  • Parallel Lines
  • Transversal Line
  • Parallel and Transversal Lines

  • 7th Grade Math Problems

    8th Grade Math Practice

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