Answer
Ratio of perimeters is $k$; ratio of areas is $k^2$.
Explanation
If triangle B has sides 3 times as long as triangle A ($k=3$), its perimeter is 3 times as large and its area is $3^2 = 9$ times as large.
Home / Library / Digital SAT: Comprehensive Practice (Math & Reading-Writing) / Synthetic flashcard
In similar triangles, if the ratio of corresponding side lengths is $k$, what are the ratios of their perimeters and areas?
Study flashcard from the deck Digital SAT: Comprehensive Practice (Math & Reading-Writing).