ORIGIN
Definition of Origin
The point of intersection of the altitudes of a triangle is called an orthocenter.
More About Origin
 The coordinates of the origin are (0, 0).
 Counting of the coordinates starts from the origin.
Example of Origin
 In the figure, x and y axis are intersecting at �O�.
 This O is called the origin of the graph. Its coordinates are (0, 0).
Video Examples: Transformational Geometry Rotations around the Origin
Solved Example on Ortho Center
Ques: Translate the book O (0, 0) down 3 units and right 4 units. What are the coordinates of its ../image_md O?
Choices:
A. (4,  3)B. (3,  4)
C. ( 3, 4)
D. (4,  3)
Correct Answer: A
Solution:

Step 1: When (0, 0) is translated down 3 units, the ycoordinate becomes  3, but the xcoordinate remains same.
Step 2: After translating (0,  3) to 4 units right, the xcoordinate of the point becomes 4, but the ycoordinate remains same.
Translate :