英數兩全字詞教學

40   正餘弦 Sine and Cosine

1. Elements   幾何原本

2. Pythagoras   畢達哥拉斯

3. Law of Sines   正弦定理

4. Law of Cosine   餘弦定理

5. Trigonometric Ratios   三角比

6. correction term   修正項

7. cultural heritage   文化遺產

8. supplementary angle of C   C 的補角

9. sine of the complementary angle   餘角的正弦

10. Book 2, Proposition 13   第 2 卷命題 13

11. hundred and eighty degrees minus C   \(180^\circ-C\)

12. sine of ninety degrees is defined to be one   \(\sin90^\circ:=1\)

13. c squared is equal to a squared plus b squared minus two a b cosine C   \(c^2=a^2+b^2-2ab\cos C\)

14. A generalization of the Pythagorean theorem on non-right triangles.   畢氏定理在斜三角形上的推廣。

15. The square on the side subtending the obtuse angle is greater than the sum of the squares on the sides containing the obtuse angle.   鈍角對邊的平方大於鈍角兩側之邊長平方和。