Kahwai's answer to R's Secondary 4 E Maths Singapore question.

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Kahwai
Kahwai's answer
232 answers (A Helpful Person)
1st
P1 parallel to BC, P1C parallel to AB
P2 parallel to BC, P2B parallel to AC

P3 more complicated
CP3 parallel to AB forms equation (x,y)
BP3 parallel to AC forms equation (x,y)

Solve for x, y then find P3