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How to do question (di),(dii)?

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Eric Nicholas K
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1681 answers (Tutor Details)
You must use the fact that several triangles are similar before assigning units to the lengths. Note that for two similar triangles PQR and STU, if PQ : ST = 3 : 1, then QR : TU = 3 : 1 and PR : SU = 3 : 1.

For ratios of areas, we square the ratios of the lengths.