Answer:
Leon is correct. (Option 1)
Step-by-step explanation:
Given that Leon verified that the side lengths 21, 28, 35 form a Pythagorean triple using this procedure.
Step 1: Find the greatest common factor of the given lengths: 7
Step 2: Divide the given lengths by the greatest common factor: 3, 4, 5
Step 3: Verify that the lengths found in step 2 form a Pythagorean triple.
we have to explain whether or not Leon is correct.
As, 3,4,5 forms a Pythagorean triplet i.e satisfies the Pythagoras theorem
![Hypotenuse^2=Base^2+Perpendicular^2](https://tex.z-dn.net/?f=Hypotenuse%5E2%3DBase%5E2%2BPerpendicular%5E2)
⇒ ![5^2=3^2+4^2](https://tex.z-dn.net/?f=5%5E2%3D3%5E2%2B4%5E2)
Let a, b, c forms a Pythagorean triplet
![a^2+b^2=c^2](https://tex.z-dn.net/?f=a%5E2%2Bb%5E2%3Dc%5E2)
Multiplied by 4 on both sides
⇒ ![4a^2+4b^2=4c^2](https://tex.z-dn.net/?f=4a%5E2%2B4b%5E2%3D4c%5E2)
⇒ ![{2a}^2+{2b}^2={2c}^2](https://tex.z-dn.net/?f=%7B2a%7D%5E2%2B%7B2b%7D%5E2%3D%7B2c%7D%5E2)
Hence, we say 4a, 4b and 4c also forms a Pythagorean triplet.
∴ multiplying every length of a Pythagorean triple by the same whole number results in a Pythagorean triple.
Hence, Leon is correct.