Contact us
Choose a category below so we can get back to you as quickly as possible.
1.畫一線段的並用圓規作垂直平分線,得一直角, 2.用圓規做直角的角平分線得45°角, 3.在一線段上用尺量出5cm,得AB邊, 4.畫另一直角三角形DEF,並使角E=90°,EF\\AB,DE=2EF,則角D=30°, 5.作平行線BC\\DF, 6.完成!OK啦
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.