Eric Nicholas K's answer to Lynn's Secondary 4 E Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
You have to correctly identify whether the two triangles which you are trying to compare are similar, or they have same bases but different heights, or they have different bases but same heights.

In some cases, as is the case for parts v and vi, I have to split he quadrilateral into two smaller triangles for easier computation and visualisation.