英數兩全字詞教學

30   圓 Circle

1. radius   半徑

2. diameter   直徑

3. circumference   圓周長

4. compass   圓規

5. semicircles   半圓

6. circular arc / circular sector   圓弧 / 扇形

7. concentric circle   同心圓

8. annulus   兩同心圓之間的環狀區域

9. major arc / minor arc   大弧 / 小弧

10. angle at the center   圓心角

11. tangent / secant / passant   切線、割線、離線

12. the arc subtended by the chord   弦所對的弧

13. the ratio of the circumference to its diameter   圓周率

14. The inscribed angle is half of the central angle that subtends the same arc on the circle.   圓周角是對同弧圓心角之半。

15. The tangent to a circle is perpendicular to the radius through the point of tangency.   圓的切線垂直於通過切點的半徑。