To find the scale factor of two similar figures, we compare the lengths of corresponding sides.Let's denote:PQ = aQR = bPR = cAnd the corresponding sides in P'Q'R' are:P'Q' = kaQ'R' = kbP'R' = kcThe scale factor, k, is the ratio of the lengths of corresponding sides:k = P'Q' / PQ = Q'R' / QR = P'R' / PRSo, the scale factor of PQR and P'Q'R' is k.
