Question

Write any five definitions and there examples 1.polygon
2.triangle
3.parallel lines
4.open and closed ray
5.ray and properties of ray​

Answer 1

$\bf \underline { Correct \: Question }$

Write the definitions of the following with there examples.

1. Polygon
2. Triangle
3. Parallel lines
4. Open and closed Curves
5. Ray and properties of ray​

$\bf \underline { Answer }$

1. What is a Polygon ?

• A Polygon is a closed figure made up of line segments (not curves) in a two-dimensional plane.
• Polygon is the combination of two words, i.e. poly (means many) and gon (means sides).
• Example :- Triangle, Square, Rectangle etc.

2. What is a triangle ?

• A triangle is the simplest form of polygon that has three sides and three vertices.
• The triangles are also classified into different types, based on the sides and angles.
• In Triangles sum of all the angles of the triangle is always equal to 180°.
• Types of Triangle :- Equilateral triangle, Isosceles triangle and Scalene triangle

3. What are Parallel Lines ?

• Two lines are said to be parallel when they do not meet at any point in a plane.
• Lines which do not have a common intersection point and never cross path with each other are parallel to each other.
• The symbol for showing parallel lines is ||.
• Example :- Railway Track, Scale, Edges of sidewalks etc.

4. What is Open and Closed Curves ?

Open Curve :-

• A curve has two endpoints, and when it does not enclose the area within itself it is known as an open curve.
• Example :- Any figure made without Line segment.

Close Curve :-

• A curve has no endpoints, and when it encloses the region or area will form, it is known as the closed curve.
• The type of curve is formed by joining the two endpoints of the open curve.
• Example :- Circle, Oval, Ellipses etc.

5. What is Ray and Properties of Ray ?

Ray :-

• Ray is another part of a line. It is a combination of a line and a line segment which has an infinitely extending end and one terminating end.
• As it’s one end is non-terminating, its length cannot be measured.
• Example :- Sun-light, Troch-Light etc.

Properties of Ray :-

• The ray have only one starting point,
• A Ray can't be measured.

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