Question 459098
There is no solution unless you either know the interior angle, or you know it is a right triangle.
The Pythagorean Theorem can be used.
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Assuming the 13 is the hypotenuse,
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{{{13^2 = x^2 + 10^2}}}
{{{169 = x^2 + 100}}}
{{{69 = x^2}}}
{{{x^2 = 69}}}
{{{x = sqrt(69)}}}
{{{x = 8.30662386}}}
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Assuming the hypotenuse is unknown.
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{{{c^2 = 10^2 + 13^2}}}
{{{c^2 = 100 + 169}}}
{{{c^2 = 269}}}
{{{c = sqrt(269)}}}
{{{c = 16.4012195}}}
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Done.