(2)
以下を参考に
https://study-line.com/sakuzu-santakasa/
⬜︎3
https://text.tomo.school/circle-three-dots/
⬜︎4
https://text.tomo.school/tangent-line/
(2)
以下を参考に
https://study-line.com/sakuzu-santakasa/
⬜︎3
https://text.tomo.school/circle-three-dots/
⬜︎4
https://text.tomo.school/tangent-line/
⬜︎5
https://study-line.com/sakuzu-kakunitobun/
合計180°の角の半分だから90°