Abot half way he gets to the formula

Then he takes the right angled triangle with shorter sides r and x, and enlarges it by a scale factor of yz so it becomes rxz by by xyz. He adds on other enlarged triangles.

Bob

why he enlarged the r and x by yz

What for?

And next step he enlarge the sides r and y by

z.(x^2+r^2)^1/2 Why exactly this equation?

Then he takes the right angled triangle with shorter sides r and x, and enlarges it by a scale factor of yz so it becomes rxz by by xyz. He adds on other enlarged triangles.

Bob

]]>https://youtu.be/6KPSmajeseI

He is talking about heron's proof

He is talking about scaling a traingle

Starting in minute 1:01

What is a traingle scaling and is there on MiF

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