Chapter 7: Further Trigonometry (Principles)

Question 1

In non-right-angled triangles, what formulas do we use to find the unknown lengths or angles?

Answer 1

Sine rule, and cosine rule
(note: Sine and Cosine rule is most commonly used in angles that aren’t right-angled triangles)

Question 2

In non-right-angled triangles, what formula do we use to find the area?

Answer 2

Area of a Triangle Formula
(1/2=absinC)

NOTE: This formula is commonly used in triangles that aren’t right-angled.