alternate angle内错角
corresponding angle同位角
vertical angle对顶角
central angle圆心角
interior angle内角
exterior angle外角
supplementary angles补角
complementary angle余角
adjacent angle邻角
acute angle锐角
obtuse angle钝角
right angle直角
美丽的江津
国内英语资讯:Central SOEs to invest heavily in virus-hit Hubei
文具盒
体坛英语资讯：Portugal launches measures to maintain sports
国际英语资讯:Protests spread across Germany over George Floyd killing in U.S.
体坛英语资讯：Italian Serie A to resume in early August
中新“快捷通道”今日开启
国内英语资讯:Life expectancy of Chinese rises to 77.3 years
快乐的一天
36朵花,180颗心