Tutor copy coordinate geometry

© 2009 -2011 tutorco.com 1 Specific Objectives: Student will be able to understand the concept of coordinate geometry. Key Concept: Introduction to coordinate geomterty Plan of action: To introduce the idea, consider the grid as shown above. The columns of the grid are lettered A, B, C etc. The rows are numbered 1, 2, 3 etc from the top. We can see that the X is in box D3; that is, column D, and row 3. D and 3 are called the coordinates of the box. It has two parts: the row and the column. There are many boxes in each row and many boxes in each column. But by having both we can find one single box, where the row and column intersect. In coordinate geometry, points are placed on the "coordinate plane" as shown below. It has two scales -one running across the plane called the "x axis" and another right angle to it called the y-axis. (These can be thought of as similar to the column and row in the paragraph above.) The point where the axes cross is called the origin and is where both x and y are zero. What they already know: Student is familiar with graphs. 5/5/4/T GRADE 5 TOPIC : GEOMETRY © 2009 -2011 tutorco.com 2 On the x-axis, values to the right are positive. On the y-axis, values above the origin are positive. (Please ignore negative numbers as Integers will be done at a later stage) A point's location on the plane is given by two numbers, one that tells where it is on the x-axis and another which tells where it is on the y-axis. Together, they define a single, unique position on the plane. So in the diagram above, the point A has an x value of 20 and a y value of 15. These are the coordinates of the point A Suggested Examples: Example 1 : Plot the point (4, 6) on a graph sheet. Answer: Example 2 : Plot the point (2, 1) on a graph sheet. Answer: © 2009 -2011 tutorco.com 3 Example 3 : Plot the point (0, 6) on a graph sheet. Answer: