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GEOMETRY BY YADAV & GEETA
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BASIC CONCEPTS
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IMPORTANT TERMS POINT LINE LINE SEGMENT RAY PLANE …………
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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
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II- LINE A LINE IS STRAIGHT AND EXTENDS ENDLESSLY IN BOTH DIRECTIONS.
A LINE CAN BE NAMED AS Line L or AB
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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
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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
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INFINITELY MANY RAYS CAN BE DRAWN WITH A GIVEN POINT AS INITIAL POINT.
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V. PLANE A PLANE IS A FLAT SURFACE WHICH EXTENDS INDEFINITELY IN ALL DIRECTIONS. A PLANE HAS LENGTH AND BREADTH, BUT NO THICKNESS. .
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(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
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(II) BY TAKING THREE DIFFERENT PONTS A,B,C IN THE PLANE BUT NOT ON THE SAME LINE.
PLANE A B C.
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