Answers

(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/

かき

⬜︎5

https://study-line.com/sakuzu-kakunitobun/

合計180°の角の半分だから90°

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