Trigonometry

Question 1

Sine Rule - Finding a Side

Answer 1

a/sin A = b/sinB = c/sin C

We can use if we have a matching pair

Question 2

Sine rule - Finding an Angle

Answer 2

sin A / a = sin B / b

Question 3

Area of a triangle

Answer 3

1/2 a b sin C

Question 4

Finding an angle with Cosine rule

Answer 4

cos A = b squared + c squared - a squared / 2 b c

Question 5

Area of a sector

Answer 5

Angle / 360 x pi r squared

Question 6

Finding a Side - Cosine Rule

Answer 6

a squared = b squared + c squared - 2 b c cos A