Geometry puzzle: ?

Geometry puzzle: ?

nostr:npub1t7srnslk5ue5nyj9uqxvyuuvrmyvqpgcffanlyh3ndrevp8kh5eshse9ft why do you even do that? I mean, half of the people have some kind of cad open most of the time, so.... 😂
nostr:npub1t7srnslk5ue5nyj9uqxvyuuvrmyvqpgcffanlyh3ndrevp8kh5eshse9ft
I have no idea how to find the answer using my brain. I saved this, hoping someone would show their work, but no luck.