Pace work
18/05/2020
form 8
Тема: Кути і відрізки.

Line:

A line is a straight figure which doesn’t have an endpoint and extends infinitely in opposite directions.

Ray:

A ray is a straight line, which starts from a fixed point and moves in one direction.

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.

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.

Types of Angles

There are basically 6 types of angles which are:

1. Acute Angle: If an angle is less than 90 degrees, then it is called an Acute angle
2. Obtuse Angle: If an angle is more than 90 degrees, then it is called Obtuse Angle
3. Right Angle: If an angle is exactly at 90 degrees, then it is called Right Angle.
4. Straight Angle: If an angle is exactly 180 degrees, then it is called Straight Angle.
5. Reflex Angle: If the angle is more than 180 degree but less than 270 degrees, it is denoted as a Reflex angle.
6. Full Angle: A 360-degree angle is called a Full angle.

Pairs of Lines

Intersecting lines: Two lines intersect if they have a point in common. This common point O is their point of intersection.

Transversal: A line that intersects two or more lines at distinct points is called a transversal.

Angles made by the transversal: There are different angles formed when the transversal cuts the lines. They are:

• Interior angles
• Exterior angles
• Pairs of Alternate interior angles
• Pairs of Alternate exterior angles
• Pairs of Corresponding angles
• Pairs of interior angles on the same side of the transversal

Transversal of Parallel Lines: We know that the parallel lines are the lines that do not meet anywhere. Transversals of parallel lines give rise to quite interesting results.

https://www.youtube.com/watch?v=6BDL2pqfzx8