Lines and angles introduction start with introducing Geometry first. Geometry is derived from two Greek words, Geo, which means Earth and Metry, which mean measurement. So basically, Geometry deals with the measurement of different figures like Point, Line, Line Segment, Angles, Circles, Squares etc.
Geometry begins with a point which denotes a location and is represented by a dot(.). A point has no dimensions i.e. no length, no width and no height, but with the help of this point, we can draw lines and angles. Now, let us give basic knowledge of lines and angles which is introduced in Class 7 syllabus.
Lines and Angles – Types and Definitions
To cover Lines and Angles Class 7 syllabus, we have generalized the topics below. Read the below topics one by one to understand the concepts of lines and angles.
What is a Line?
A line is a straight figure which doesn’t have an endpoint and extends infinitely in opposite directions.
What is Ray?
A ray is a straight line, which starts from a fixed point and moves in one direction.
What is a Line Segment?
A portion of the line formed with two definite points is called a Line Segment. A line is a one-dimensional figure and has no thickness.
What is an Angle?
When we join two line segment at a single point, an angle is formed or we can say, an Angle is a combination of two line segments at a common endpoint. This common point is called Vertex of the angle and the two line segments are sides or arms of the angle formed.
What are the types of angles?
There are basically 6 types of angles which are:
- Acute Angle: If an angle is less than 90 degrees, then it is called an Acute angle
- Obtuse Angle: If an angle is more than 90 degrees, then it is called Obtuse Angle
- Right Angle: If an angle is exactly at 90 degrees, then it is called Right Angle.
- Straight Angle: If an angle is exactly 180 degrees, then it is called Straight Angle.
- Reflex Angle: If the angle is more than 180 degree but less than 270 degrees, it is denoted as a Reflex angle.
- Full Angle: A 360-degree angle is called a Full angle.
Class 7 students should exercise problems on Lines and Angles to understand the concepts. Lines and Angles Class 7 ICSE, CBSE and Other State Boards covers almost the same topics as per mentioned above for lines and angles.
|Additional Lines and Angles Related Links|
|Lines and Angles Class 9||Lines and Angles Basic Terms|
|AP Board Class 9 Lines and Angles||Lines and Angles Introduction Class 6|
|RD Sharma Class 9 Lines and Angles||Parallel Lines-Transversals-Angle|
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