Describe the location of the point having the following coordinates. zero abscissa, negative ordinate

a graph can be divided into 4 quadrants.

a zero abscissa, means the point lies on the origin.

a negative ordinate means the point lies on the y axis in the third and fourth quadrants.

geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

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