Answer:
c = √74
Explanation:
You want the length of the hypotenuse in a right triangle with legs 5 and 7.
Pythagorean theorem
The equation relating the side lengths of the triangle is given. Fill in the values to find c:
a² +b² = c²
5² +7² = c²
25 +49 = c²
c² = 74
c = √74 . . . . . . take the square root
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Additional comment
It does not matter which leg you call 'a' and which one you call 'b'. The sum of a² and b² is the same with the values reversed.
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