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This appears to be a comparison of two similar triangles. Measure the length of a corresponding side of each triangle. Let the side having the shorter length be b, and c the side having the longer length. Then the scale is b : c or b/c If possible multiply or divide the numbers forming the ratio to provide an answer in its lowest terms.
Tautologically!
Scale factor and perimeter are related because if the scale factor is 2, then the perimeter will be doubled. So whatever the scale factor is, that is how many times the perimeter will be enlarged.
If the sides AB, BC and CA of triangle ABC correspond to the sides DE, EF and FD of triangle DEF, then the two triangles are congruent if:AB = DE, BC = EF and CA = FD (SSS)AB = DE, BC = EF and angle ABC = angle DEF (SAS)AB = DE, angle ABC = angle DEF, angle BCA = angle EFD (ASA)If the triangles are right angled at A and D so that BC and EF are hypotenuses, then the triangles are congruent ifBC = EF and AB = DE (RHS)BC = EF and angle ABC = angle DEF (RHA).
The areas are related by the square of the scale factor.