Claire's bedroom floor is 12 1/2 feet by 15 1/4 feet. she wants to buy new carpeting to cover her bedroom floor. if the total cost of the carpeting is $762.50, what is the unit price of the carpet per square foot?

geometry: triangles

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lessons

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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

it would take 5 hours i think idk i'm not that good at math.can you me with my questions i need asap.