a²+b² = c²
Well we know that a 3-4-5 triangle follows this rule, if a=3, b=4, c=5.
3² + 4² = 5² ⇒ 9 + 16 = 25 ⇒ 25 = 25
Now let's multiply all the sides by 2.
(3*2)² + (4*2)² = (5*2)²
6² + 8² = 10²
36 + 64 = 100
100 = 100
Therefore, 2a, 2b, and 2c are also possible length of a right triangle.