triangle ABC similar triangle PQR area of triangle ABC is 289 CM square and area of triangle PQR is 144 CM square find BC/QR
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The three-dimensional structure of a double-stranded DNA molecule may be described by distinguishing the helical turns of the DNA duplex from any superhelical turns that might be superimposed upon the duplex turns. ... These results are interpreted as showing that human DNA is supercoiled.
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