豌豆讲数学 https://www.youtube.com/@wandoujiangshuxue 在其中者打*
圓內四個方形求面積.jpg
* https://www.youtube.com/watch?v=KX6bjxjgUGM
https://www.youtube.com/watch?v=h5735Jk5OkE
方內圓用邊角矩形求半徑.jpg
* https://www.youtube.com/watch?v=tyOFHF5J_Go
https://www.youtube.com/watch?v=PltyB4PoBJ8
三圓求陰影面積.jpg
* https://www.youtube.com/watch?v=WfG5hcpw8RI
https://www.youtube.com/watch?v=lg69b37JQBs
https://www.youtube.com/watch?v=uhg5lJVUV2I
用圓內四邊形求半徑.jpg
* https://www.youtube.com/watch?v=VooGRQf-JhA
矩形內半圓1.jpg
* https://www.youtube.com/watch?v=NF1AFcxyDw8
https://www.youtube.com/watch?v=lSVBLt1ILyc
直角三角兩邊生正方形求陰影面積.jpg	出自「奇妙的数学」https://www.youtube.com/@onemath
https://www.youtube.com/watch?v=n9maLDjOF0k
已知三邊求頂角.jpg
* https://www.youtube.com/watch?v=QlsZBaF2ZhE
部分角部分邊1.jpg
* https://www.youtube.com/watch?v=4EsW-L3ceOs
75度三角形求面積.jpg
* https://www.youtube.com/watch?v=0jypdDBPwHI
30_45_75度角.jpg
* https://www.youtube.com/watch?v=rtlh1EbjDrE
兩邊兩底角.jpg
* https://www.youtube.com/watch?v=ZnBJIT9roPo
https://www.youtube.com/watch?v=R3DeTb-yETU
tan_2a.jpg	出自「JOHNSON-MATH」https://www.youtube.com/@JOHNSON-MATH
https://www.youtube.com/watch?v=gEnB2G-suvI