Answer:
10.3
Explanation:
You want the length of the hypotenuse of the right triangle with legs 5 and 9.
Pythagorean theorem
The Pythagorean theorem tells you the square of the hypotenuse is the sum of the squares of the two legs:
c² = a² +b²
c² = 5² +9² = 25 +81 = 106
c = √106 ≈ 10.3
The length of the third side is about 10.3 units.
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