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Contents
Basic Concepts 1 2
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Basic
Concepts
Distance
between two points
  To
find the distance between two points A and B, by Pythagoras Theorem, Note:
It does not matter whether you use x1 - x2 or x2
- x1 (same for y-values). Since this value is squared, the final
results are the same.
Midpoint
of two points
 C
is the midpoint of the segment AB.
-->
AC = BC
-->
AK = KL (projection of AB onto AL)
-->
x1 - x = x - x2
-->
 Similarly,
y is worked out to be
 Hence,
the coordinates of the midpoint C are
 For
the following quadrilaterals, their diagonals intersect at their midpoints :
parallelogram, square, rectangle and rhombus.
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