1. Trigonometry-1 In Greek this just means: Working with Triangles

2. Trigonometry Revise Triangles Name Sides and Angles Test your Understanding

3. Revise Triangles Scalene triangle Isosceles triangle Equilateral triangle Right angled triangle Click the name we give to the triangle:

4. Revise Triangles Scalene triangle No equal sides or angles

5. Revise Triangles Scalene triangle Isosceles triangle Equilateral triangle Right angled triangle Click the name we give to the triangle:

6. Revise Triangles Isosceles triangle Two equal sides Base angles equal

7. Revise Triangles Scalene triangle Isosceles triangle Equilateral triangle Right angled triangle Click the name we give to the triangle:

8. Revise Triangles Equilateral triangle All sides equal All angles equal (60  )

9. Revise Triangles Scalene triangle Isosceles triangle Equilateral triangle Right angled triangle Click the name we give to the triangle:

10. Revise Triangles Right angled triangle One angle equals 90 

11. Naming Triangles  In trigonometry we work with right angled triangles.  To label a triangle we start by naming the corners or vertices.  Write any capital letter at each corner. We often label the corners A, B and C. P Q R

12.  To label the sides you need to know what side is opposite each corner.  Put your finger on a corner. Naming Triangles P Q R

13.  Move your finger down the middle of the triangle. Naming Triangles P Q R  The side you get to is the opposite side.  The name we give to the opposite side is the small letter of the letter used for the corner. p Copital letter Small letter

14.  Name the side opposite corner Q. Naming Triangles P Q R

15.  Name the side opposite corner Q. Naming Triangles P Q R q Copital letter Small letter

16.  Name the side opposite corner R. Naming Triangles P Q R

17.  Name the side opposite corner R. Naming Triangles P Q R r Small letter Capital letter

18. Naming Triangles & Sides P Q R r p q Shorthand for writing triangle PQR is: ∆PQR

19.  Name the sides of triangle ABC. Naming Triangles A C B

20.  Name the sides of triangle ABC. Naming Triangles A C B a Copital letter Small letter

21.  Name the sides of triangle ABC. Naming Triangles A C B

22.  Name the sides of triangle ABC. Naming Triangles A C B c Copital letter Small letter

23.  Name the sides of triangle ABC. Naming Triangles A C B

24.  Name the sides of triangle ABC. Naming Triangles A C B b Small letter Capital letter

25. Naming Triangles & Sides A C B b a c Shorthand for writing triangle ABC is: ∆ABC

26. Naming Triangles A C B b a c Side a is also called side BC. Side b is also called side AC. Side c is also called side AB. It is often more convenient to name the sides with small letters.

27.  You are working with ∆MNO.  Which side would you call m? Label the Sides M N O MN MO NO

28.  You are working with ∆MNO.  Which side would you call n? Label the Sides M N O m MN MO NO

29.  You are working with ∆MNO.  Which side would you call o? Label the Sides M N O n MN MO NO

30.  You are working with ∆STU.  Which side would you call s? Label the Sides S T U ST SU TU

31.  You are working with ∆STU.  Which side would you call t? Label the Sides S T U s ST SU TU

32.  You are working with ∆STU.  Which side would you call u? Label the Sides S T U t ST SU TU

33. Well Done!

34. Oops! Click to try again.