Michael is painting the wall of his square room. Each of the four walls measures 8ft wide by 10.5ft tall. One gallon of paint covers 60ft2. How many gallons of paint will he need?

(x, y)→(x − 8, y − 7)

step-by-step explanation:

enjoy!

geometry: triangles

solvers

lessons

answers archive

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

the bolded word " farsighted" could be replaced with visionary.