Answer:
C < E < D
Explanation:
You want the angles of triangle CDE listed from least to greatest, given sides DE = 9, CD = 10, CE = 11.
Angle order
The order of the angles of a triangle is the same as the order of their opposite sides. Given the name of a triangle side, the opposite angle will be the one labeled with the vertex not included in the side name.
The ordering of the sides is ...
DE = 9 < CD = 10 < CE = 11
Then the order of the angles is ...
C < E < D
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