Eric Nicholas K's answer to QN's Junior College 1 H1 Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
1st
We need to express our total area S in terms of only one variable, so we need to figure out how to express the length of the water level EF in terms of h only.
QN
QN
3 years ago
For part a, why the equation cannot be EF/EB = DQ/DP?

l/30 = h/4√21
Eric Nicholas K
Eric Nicholas K
3 years ago
Because the triangles from which this equation is derived are not similar.

We need to find two similar triangles so that we can make the relevant similarity ratio statements.
QN
QN
3 years ago
Thanks!!