Incircle area in 3-4-5 triangle?

About

I animate and provide some explanation for classic and newer "proofs without words," which are typically diagrams without any words that indicate how a theorem could be proved. I often pay homage to Proofs Without Words by including some animations without narration (only dramatic music :) ). I have also noticed that while there are many wonderful visual proofs available on YouTube, most of the creators do not credit the original visual proofs. I will do my best to include links and citations for each visual proof so that you can track down the original static images, which have a beauty and a wonder all their own. I create my animations using the amazing software Manimgl from 3Blue1Brown. If you want to buy me a coffee, you can do that here: https://www.buymeacoffee.com/VisualProofs