1. GEOMETRY BY YADAV & GEETA

2. BASIC CONCEPTS

3. IMPORTANT TERMS
POINT
LINE
LINE SEGMENT
RAY
PLANE
…………

4. POINT.
A POINT OCCUPIES A POSITION AND ITS LOCATION CAN BE DETERMINED.
A POINT HAS NO LENGTH, BREADTH OR THICKNESS.
A POINT IS DENOTED BY A SINGLE CAPITAL LETTER SUCH AS A,B,P etc. AND READ ‘POINT A’ ‘POINT B’ etc. . B R S P Q P

5. II- LINE A LINE IS STRAIGHT AND EXTENDS ENDLESSLY IN BOTH DIRECTIONS.
A LINE CAN BE NAMED AS
Line L or AB

6. III-LINE SEGMENT A LINE SEGMENT IS A PORTION OF A LINE.
IT HAS TWO END POINTS.
THERE IS A UNIQUE LINE SEGMENT JOINING TWO GIVEN POINTS A&B.
A B
IT IS DENOTED AS AB

7. IV. RAY
A RAY STARTS FROM A FIXED POINT AND EXTENDS ENDLESSLY IN ONE DIRECTION.
A RAY IS A PART OF ALINE HAVING ONLY ONE END POINT O. THE END POINT IS CALLED INITIAL POINT OF RAY.
A RAY IS NAMED BY IT’S INITIAL POINT O AND ONE MORE POINT ON IT. O A

8. INFINITELY MANY RAYS CAN BE DRAWN WITH A GIVEN POINT AS INITIAL POINT.

9. V. PLANE
A PLANE IS A FLAT SURFACE WHICH EXTENDS INDEFINITELY IN ALL DIRECTIONS.
A PLANE HAS LENGTH AND BREADTH, BUT NO THICKNESS. .

10. (I) BY WRITING A SINGLE SMALL LETER OF ENGLISH ALPHABET.
A PLANE CAN BE NAMED AS
(I) BY WRITING A SINGLE SMALL LETER OF ENGLISH ALPHABET. Z
PLANE Z

11. (II) BY TAKING THREE DIFFERENT PONTS A,B,C IN THE PLANE BUT NOT ON THE SAME LINE.
PLANE A B C.