maths facts 2.



pythagoras's theorm



	
	\
	|\
      a	| \  c
	|  \
	|   \
	-----
	   b



 length of the side of a right-angle triangle


	c = sqrt( a^2 + b^2 )




distance between two points on a map

	a = x1 - x2	x values of the two co-ordinates

	b = y1 - y2



	e.g.


		point 1		12, 25

		point 2		15, 29


	a = 15 - 12
	  = 3m


	b = 29 - 25
	  = 4m


	c = sqrt( 3^2 + 4^2 )

	  = sqrt( 25 )

	  = 5m
