Phép quay giữ nguyên đa giác đều - Toán lớp 9 mới -OLM.VN

#rotation #olm #sgkmoi #thayDo #toanlop9 🟢 Main content of the lesson: Given a regular polygon A_1A_2...An_n (n 2, $n$ is a natural number) with center O. The rotation that keeps the regular polygon A_1A_2...An_n is a rotation with center O that turns each vertex of the regular polygon into a vertex of that regular polygon. NOTE Only the following rotations keep the above regular polygon intact: the forward (reverse) rotations $\alpha^\circ$ center $O$, with $\alpha^\circ$ taking the values ​​respectively: 🟢 Learn interactively directly on OLM according to each book series: 📌 Canh Dieu book series: https://olm.vn/bg/toan-lop-9-canh-dieu 📌 Connecting knowledge with life book series: https://olm.vn/bg/toan-lop-9-knttvcs 📌 Creative horizon book series: https://olm.vn/bg/toan-lop-9-chan-tro... ---------------------------------------------------------------- © Copyright belongs to OLM.VN © Do not Reup.