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What is the length

What is the length-example-1
User Yolk
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1 Answer

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See, please, this explanation:
1) ΔRST~ΔPQT, it means RS/PQ=TS/TQ=TR/TP
2) according to issue 1) 6/4=RS/10, RS=3*5=15 cm.
Answer: 15cm. (A)
User FeeFiFoFum
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