Question

The shapes below are mathematically similar.

х
8 cm
9 cm
12 cm
Calculate the length of side x.

Answer 1

x= 6 i think
the way you worded the question is confusing but i think you meant that there are two shapes both w 2 sides given

you do 12/8 which is 1.5
1.5 is the scale factor so you divide 9 by 1.5 because 9 is on the bigger shape you divide