Medal + fan!
Determine is the two figures are similar. If so, give the ratio of smaller to larger. The figures are not drawn to scale.
A yes; 1:10
B yes; 1;4
C yes; 1:2
D no

Question

love_333 · Answer

attachment

erak · Answer

So test each corresponding side to see if there's a common increase

18/3 = 6
8/4 = 2
72/18 = 4

They're all increased by a different factor, so therefore they are not similar

love_333 · Answer

Oh, cool. I've never worked on these before, I didn't know you could do it that easy