Q2) EX 4.5 Class 6th Maths Basic Geometrical Ideas | Maths Class 6th CBSE NCERT | Apni ClassRoom

Q2) EX 4.5 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 6th exercise 4.5 question number 2,
class 6th maths exercise 4.5 question number 2,
class 6th maths exercise 4.5 basic geometrical ideas,
6th class maths ex 4.5 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
6th class maths,

#Class6thMaths
#class6thMathematics
#BasicGeometricalIdeas
#BasicGeometricalIdeasClass6th

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 4.5
1. Draw a rough sketch of a quadrilateral PQRS. Draw its diagonals. Name them.
Is the meeting point of the diagonals in the interior or exterior of the quadrilateral?
2. Draw a rough sketch of a quadrilateral KLMN. State,
(a) two pairs of opposite sides,
(b) two pairs of opposite angles,
(c) two pairs of adjacent sides,
(d) two pairs of adjacent angles

[swatijaiswal]

Sir I have some doubt so please remind it about opposite and adjacent angles.