Find the length of side a.

12

=> here's your solution

=> hypotenuse = 13

=> base. = 5

=> we need to find out perpendicular

=> so, we know. h^2 = b^2 + p^2

=> now putting value in this formula

=> p^2 = 13^2 - 5^2

=> p^2 = 169 - 25

=> p^2 = 144

=> p = √144

= >> p = 12

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