Answer:
18
Step-by-step explanation:
Let x be the missing length.
Since the figures are similar, the ratio of their similarity is :
6/9 = 12/x By dividing LHS numerator and denominator by 3
2/3 = 12/x
2x = 3 × 12
2x = 36 Divide both sides by 2
x = 18
Therefore, the missing length is 18
