Page 151 - Math_Genius_V1.0_C4_Flipbook

E:\Working\Focus_Learning\Math_Genius_4_(25-10-2023)\Open_Files\Chap-08
\\December 6, 2023 12:54 PM Bharat Arora P-6 Reader _________________________ Date: ___________________

5. State whether the following statements are ‘true’ or ‘False’.

(a) All squares are rectangles.

(b) All rectangles are squares.

(c) A polygon has two sides.

(d) There are four vertices in any squares.

(e) All quadrilaterals are rectangles.

circLes

Look at these objects and observe their shapes.

The shape of each object represents a circle. You can see
many objects around you which have a shape of a circle.

A circle is a simple closed curve, all point on which are at equal circle
distance from a fixed point inside it. The fixed point is called the O centre

centre of the circle.

Parts of a circle

Take a sheet of paper and trace a circle on it using a bangle. Cut along

the traced lines and fold the paper circle twice to make crease as shown

below. Open and observe it. The point where the two creases meet is
called the centre of the circle and the crease passing through the centre

is called the diameter of the circle.

Creases (Diameters)

1st fold 2nd fold Unfold
Centre

The distance from the centre of Centre of
circle (O)
the circle to any point of the circle
Diameter (AB) Note
is called a radius of the circle. O
A B The plural of
A half circle is called a semicircle. Radius (OR) radius is radii.
And all radii of a
The distance around the circle are equal
Circumference in length.
circle is called circumference. R

Mathematics-4 149