Answer:
A) 5, 12, 13
Step-by-step explanation:
[tex]5^2 + 12^2 = 169[/tex]
[tex]13^2 = 169[/tex]
∴ Option A is a Pythagorean triad.
[tex]1^2 + 2^2 = 5[/tex]
[tex]3^2 = 9[/tex]
∵[tex]5\neq 9[/tex], ∴ Option B is not a Pythagorean triad.
[tex]6^2 + 9^2 = 117[/tex]
[tex]10^2 = 100[/tex]
∵[tex]117\neq 100[/tex], ∴Option C is not a Pythagorean triad.
∴ A is the only Pythagorean triad out all three options.
Hope this helps :)