1. GEOMETRICAL SHAPES
PREPARED BY
SUJA T V
PRT
K V KANNUR

2. Closed curves
A curve starts and ends at the same point.

3. Simple closed curves
A closed curve which does not cross itself is called a simple closed curve.

4. Polygons
Simple closed curves formed of three or more line segments are called polygons.

5. Triangle
A polygon formed by three line segments is called Triangle.

6. QUADRILATERAL
A polygon formed by four line segments is called a quadrilateral.

7. SQUARE, RECTANGLE
A Square and a Rectangle are special kinds of a quadrilateral.

8. CIRCLE

9. Terms related to Circle
Centre
Radius
Diameter
Chord
Circumference

10. CENTRE
Centre

11. A line segment drawn from the centre to any point on a circle
Radius O P
A line segment drawn from the centre to any point on a circle

12. DIAMETER
Diameter N M O
A line segment drawn through the centre that joins two points on a circle.

13. Chord
A line segment that joins two points on a circle. A B

14. The Diameter of a circle is also a ChordB A K D
The line segments A B and D K are the cords of the circle O
The Diameter of a circle is also a Chord

15. circumference of the circle
Length of the circle
is called
the
circumference of the circle

16. The radius is always half of the diameter of a circleN
Diameter O P
Radius M