Expert I Introductory Trigonometry Only For 20-2

Question 1

Sine Law

Answer 1

Sine law is a way of finding a missing angle or side given three other pieces of information (either two sides or two angles, and then one of the other).

Question 2

Cosine Law

Answer 2

Cosine law is a way of finding a missing angle or side in a triangle when you have three pieces of information and need to find the fourth, where one of those is an angle and the other three are side lengths.

Question 3

What are all the formulae that we can use only with right triangles?

Answer 3

• Find sides using Pythagorean Theorem (a^2+b^2=c^2)
• Basic Trig Ratios:
  Sine = opposite/hypotenuse
  Cosine = adjacent/hypotenuse
  Tangent=opposite/adjacent
  We can find missing sides and/or missing angles in right triangles using these ratios.