# Co-ordinate Geometry.pptx

Introduction to Co-ordinate Geometry Mapping the plane Distance between two points Distance formula Properties of distance Midpoint of a line segment Midpoint formula

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### Co-ordinate Geometry.pptx

• 2. INDEX  INTRODUCTION  MAPPING THE PLANE  DISTANCE BETWEEN TWO POINTS  PROPERTIES OF DISTANCE  MIDPOINT OF A LINE SEGMENT
• 3. INTRODUCTION The French Mathematician Rene Descartes developed a new branch of Mathematics known as Analytical Geometry or Coordinate Geometry. Coordinate geometry (or analytic geometry) is defined as the study of geometry using the coordinate points. Using coordinate geometry, it is possible to find the distance between two points, dividing lines in m:n ratio, finding the mid-point of a line, calculating the area of a triangle in the Cartesian plane, etc.
• 4. MAPPING THE PLANE Draw a perpendicular line and mark X-axis and Y-axis. In horizontal line the positive numbers lie on right side of zero and negative numbers on left side of the zero. In vertical line the positive numbers lie above zero and the negative numbers lie below zero. The x co-ordinate is called the Abscissa and the y co- ordinate is called the Ordinate. The X and Y axis divides the plane into four regions , they are called as Quadrants.
• 6. Plot ( -4 , -2 ) To plot the points (-4,-2) in the Cartesian coordinate plane. We follow the x-axis until we reach -4 and draw a vertical line at x = -4 Similarly follow the y-axis until we reach -2 and draw a horizontal line at y = -2
• 7. DISTANCE BETWEEN THE TWO POINTS Distance between two points is the length of the line segment that connects the two points in a plane. The formula to find the distance between the two points is usually given by d=√((x2 – x1)² + (y2 – y1)²).
• 8. PROPERTIES OF DISTANCE  COLLINEAR Dis (A,B) + Dis (B,C) = Dis (A,C)  EQUILATERAL TRIANGLE Dis (A,B) = Dis (B,C) = Dis (C,A)  ISOSCELES TRIANGLE Dis (A,B) = Dis (B,C) or Dis (A,B) = Dis (C,A)
• 9.  PARALLELOGRAM Dis (A,B) = Dis (C,D) Dis (A,D) = Dis (B,C)  RHOMBUS Dis (A,B) = Dis (B,C) = Dis (C,D) = Dis (D,A)
• 10. MIDPOINT OF A LINE SEGMENT The midpoint of a segment is the point on the segment that is equidistant from the endpoints. In the above diagram, B is the midpoint of A and C.
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