Answer:
D
Step-by-step explanation:
when flipping and turning the second triangle, so that it is oriented as the first triangle (we see DE corresponds to AB - consider at what corner point the right angle is : at A and at D; DF corresponds to AC, EF corresponds to BC), we see immediately that BCA is the same sequence of corners as the corresponding EFD.
As in decimal it would be 0.4 but if you want a fraction it could be 4/10
Arithmetic sequences have a pattern of numbers that are positive and negative but are a constant amount.
In this case the answer is A.
