Note that each successive triangle has 1/8 the area of the one before, and the each width is half of the one before

since we know that the area of each succesive triangle is 1/8 of the previous one, and that , then we can just set up the above equation and ask what would make the statement true?

well?

taking

Understand that htis only works because everything in the equation is understood to be constant except for b_s

s=smaller triangle L=larger