Co-ordinate Geometry

• In finding the area of a triangle, we use modulus to change the negative integer to positive
• Each of the vertices of a quadrilateral is named in an anticlockwise cycle
• Area of a triangle = 1/2 [ x1 ( y2 - y3 ) + x2 ( y3 - y1 ) + x3 ( y1 - y2 ) ] sq units.
• midpoint = x1 + x2 / 2 , y1 + y2 / 2
• Distance formula = √(x2 - x1)^2 + (y2-y1)^2
• Distance formula when one point is the origin = √x^2 + y^2
• Internal section formula : [ m1x2 + m2x1/ m1 + m2 , m1y2 + m2x1/ m1 + m2 ]
• What are m1 and m2?

  m1 and m2 are the ratios of a given section