Please help me out.. Describe situations in which you have heard a percent increase or percent decrease discussed. For example, you might mention hearing a report that school revenues have increased by five percent. Help me please :(

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+

25.45584

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x