三割九角形
https://gyazo.com/bdb0b4d3557d8310a491858944c432cd https://gyazo.com/d53adcca74e263144a6a4a61083eaf85 https://gyazo.com/ed95f4f8d7bcc8eb44827c859766e796
https://gyazo.com/b4bdb24aafef603b15ba806c2eff9df7 https://gyazo.com/311a47a5a501889d86108c65e44adb39