Answer: √698 or 26.42 (2 d.p.)
Explanation:
Pythagoras' Threorem is a² + b² = c²
Substitute 13 for a and 23 for b
13² + 23² = x²
169 + 529 = x²
698 = x²
x = √698 = 26.42 (2 d.p.)
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