Similar to 三角法

Unit circle

Right angle

Niven's theorem

Argument (complex analysis)

Morrie's law

Law of cosines

Law of cotangents

Radian

Cathetus

Mygalomorphae

29th century BC

28th century BC

27th century BC

26th century BC

25th century BC

24th century BC

23rd century BC

22nd century BC

20th century BC

19th century BC

18th century BC

17th century BC

16th century BC

15th century BC

14th century BC

11th century BC