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Math·Geometry and Trigonometry·Lines, angles, and triangles

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The triangle inequality theorem states that the sum of any two sides of a triangle must be greater than the length of the third side. If a triangle has side lengths of $10$ and $11$, which inequality represents the possible lengths, $x$, of the third side of the triangle?

A

$x<21$

B

$x>21$

C

$1<x<21$

D

$x<1\text{ or }x>21$