List the angles of from smallest to largest.

The correct answer is: In △ABC, Sides shortest to longest are ∠ABC, ∠BAC, ∠ACB

Step by step explanation: 
Given: In △ABC

AB = 12

AC = 7

BC = 10
Step 1:
Find all angles of triangle.
In △ABC,

AB > BC > AC
side opposite to AB is ∠ACB.
side opposite to BC is ∠BAC.
side opposite to AC is ∠ABC.
As,

AB > BC > AC
(We know that, in triangle, the angle opposite to largest side is largest angle.)

∴ ∠ACB > ∠BAC > ∠ABC
Hence, in △ABC, sides smallest to largest are

∠ABC, ∠BAC, ∠ACB
Final Answer:
In △ABC, Sides shortest to longest are ∠ABC, ∠BAC, ∠ACB.