How would i determine if this is right or not ?

You use the pythagorean theorem to check

Square the smaller sides 3 and 4, then add those results up

3^2 = 9

4^2 = 16

9+16 = 25

Note how this is equal to the value of 5^2 which is squaring the longest side of the 3-4-5 triangle.

Another way you can write it down is like this

a^2 + b^2 = c^2

3^2 + 4^2 = 5^2

9 + 16 = 25

25 = 25

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step-by-step explanation: