Contact us
Choose a category below so we can get back to you as quickly as possible.
如圖,如果要將四邊形ABCD繞O點旋轉90°,得到新的四邊形abcd,作法如下:連結AO,再從O點作一直線Oa, ;並使∠aOA為所要求的90°(如果有旋轉方向要求的,也應使旋向符合.圖中所作的是逆時針方向),Oa=OA;連結BO,再…
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.