Pythagoras theorem and trigonometry 2

Question 1

What does the graph of sine look like?

Answer 1

Starts at 0 and goes up cutting at the 180, 360 points

Question 2

What does the graph of cos look like?

Answer 2

Starts at 1 starts by going down and then cutting at 90 and 270.

Question 3

What is the sine rule and when can it be used?

Answer 3

Can only be used for triangles with 2 known sides and angles including an unknown (x). For finding sides -> ( a/sinA = b/sinB = c/sinC). For finding angles -> (sinA/a = sinB/b = sinC/c). Then replace in the figures

Question 4

In trig what do the a and A represent?

Answer 4

The a represents sides and A represents an angle.

Question 5

What is the cos rule and when can it be used?

Answer 5

Can only be used when you have 3 sides and 1 angle including an unknown. For sides (a ² = b ² + c ² - 2bc x COS(A)). For finding angles (COS(A) = a² + b ² + c ² / 2bc

Question 6

How to find the length of the longest horizontal of a cuboid with dimensions?

Answer 6

D = √ a ² + b ² + c ²

Question 7

How to calculate area of a triangle using trig?

Answer 7

Area = ab sin(c) / 2