We know that two figures are congruent if the figures have the same shape but different sizes.
The correct options are A, C, and E.
Particularly for triangles, two triangles are congruent if the measures of the interior angles are equal.
Here we can see that we have two right triangles, and we want to see what extra information would imply that the triangles are congruent.
A) ∠B ≅ ∠M
If two angles (not the 90° ones) are equal, we also know that both triangles have the 90° angles equal, then the third pair of angles must also be equal, meaning that the triangles are congruent.
C) △ABC was rotated and dilated by a scale factor between 0 and 1.
This would imply that triangle ABC was only translated an reduced in size to generate NML, then the shape is non-changed, this would imply that the figures are congruent.
E) ∠C ≅ ∠L
Exact same reasoning as in A.
Option B is trivial, so it does not add any useful information, option D is false, as we can see the orientations are different.
Then the correct options are:
A, C, and E.
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