Скачать или смотреть Q5) EX 4.2 Class 6th Maths Basic Geometrical Ideas | Maths Class 6th CBSE NCERT | Apni ClassRoom

Q5) EX 4.2 Class 6th Maths Basic Geometrical Ideas | Maths Class 6th CBSE NCERT | Apni ClassRoom

Hello students, in this chapter you are going to learn a very good concepts related to the basic geometrical ideas..

I will first tell you what is exactly a geometrical means which is very important to know for understanding the whole chapter.

class 6 exercise 4.2 question number 5,
class 6 maths exercise 4.2 question number 5,
class 6 maths exercise 4.2 basic geometrical ideas,
6 class maths ex 4.2 chapter 4 basic geometrical ideas,

We will go topic wise
#1) What is a Point?
#2) what is a Line?
#3) What is a Line Segment ?
#4) What is a Ray ?
#5) Intersecting Lines and
#6) Parallel Lines
#7) Curves
#8) Polygons
#9) Angles
#10) Triangles
#11) Quadrilaterals
#12) Circles
6 class maths,

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What have we discussed?
1. A point determines a location. It is usually denoted by a capital letter.
2. A line segment corresponds to the shortest distance between two points. The line
segment joining points A and B is denoted by AB.
3. A line is obtained when a line segment like AB is extended on both sides indefinitely;
it is denoted by AB s ruu
or sometimes by a single small letter like l.
4. Two distinct lines meeting at a point are called intersecting lines.
5. Two lines in a plane are said to be parallel if they do not meet.
6. A ray is a portion of line starting at a point and going in one direction endlessly.
7. Any drawing (straight or non-straight) done without lifting the pencil may be
called a curve. In this sense, a line is also a curve.
8. A simple curve is one that does not cross itself.
9. A curve is said to be closed if its ends are joined; otherwise it is said to be open.
10. A polygon is a simple closed curve made up of line segments. Here,
(i) The line segments are the sides of the polygon.
(ii) Any two sides with a common end point are adjacent sides.
(iii) The meeting point of a pair of sides is called a vertex.
(iv) The end points of the same side are adjacent vertices.
(v) The join of any two non-adjacent vertices is a diagonal.
11. An angle is made up of two rays starting from a common starting/initial point.
Two rays OA u ruu and OB u ruu
make ?AOB(or also called ?BOA ).
An angle leads to three divisions of a region:
On the angle, the interior of the angle and the exterior of the angle.
12. A triangle is a three-sided polygon.
13. A quadrilateral is a four-sided polygon. (It should be named cyclically).
In any quadrilateral ABCD, AB & DC and AD & BC are pairs of opposite
sides. ?A & ?C and ?B & ?D are pairs of opposite angles. ?A is adjacent
to ?B & ?D ; similar relations exist for other three angles.
14. A circle is the path of a point moving at the same distance from a fixed point.
The fixed point is the centre, the fixed distance is the radius and the distance
around the circle is the circumference.
A chord of a circle is a line segment joining any two points on the circle.
A diameter is a chord passing through the centre of the circle.
A sector is the region in the interior of a circle enclosed by an arc on one side
and a pair of radii on the other two sides.
A segment of a circle is a region in the interior of the circle enclosed by an arc
and a chord. The diameter of a circle divides it into two semi-circles.

Exercise 4.2
1. Classify the following curves as (i) Open or (ii) Closed.
2. Draw rough diagrams to illustrate the following :
(a) Open curve (b) Closed curve.
3. Draw any polygon and shade its interior.
4. Consider the given figure and answer the questions :
(a) Is it a curve? (b) Is it closed?
5. Illustrate, if possible, each one of the following with a rough diagram:
(a) A closed curve that is not a polygon.
(b) An open curve made up entirely of line segments.
(c) A polygon with two sides.