Acelus
AABC-AQRS
Find the missing side length, m.
Source
10
А
2
m = [?]

Answer: m=5
Step-by-step explanation:
Because the triangles are similar, AC/QS = AB/QR
Substituting in the given side lengths,
2/4 = m/10
1/2 = m/10 -> m=5