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Find the length of the leg x on the right triangle below. Enter the exact value, not a decimal approximation.

13x10[Graphs generated by this script: initPicture(-3,10+3,-3,10+3);path([[0,0],[10,0],[0,8.3066238629181],[0,0]]);text([10/2,8.3066238629181/2],'13','right');text([0,8.3066238629181/2],'x','left');text([10/2,0],'10','below');]

x=  

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