What are the possible lengths for x, the third side of a triangle, if two sides are 21 and 10

To solve we need to use Pythagoras theorem (  )

There are 2 possible lengths for x: hypotenuse or one of the 2 shorter sides.

Hypotenuse:
10^{2} + 21^2 = 
100+441= 

23.3≈x

Shorter leg:


= 441-100 

x≈18.47

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