Trigonometry

Question 1

Is it right angled?
Yes, is there an angled involved?
No.

Answer 1

Pythagoras

a2^ + b2^ = c2^

Question 2

Is it right angled?
Yes, is there an angle involved?
Yes.

Answer 2

SOH CAH TOA

Question 3

Is it right angled angled?
No, do we want the area?
Yes.

Answer 3

0.5abSinC

Question 4

Is it right angled?
No, do we want the area?
No, is there a matching pair?
No.

Answer 4

a2^ = b2^ + c2^ - 2bc x CosA

Question 5

Is it right angled?
No, do we want the area?
No, is there a matching pair?
Yes.

Answer 5

side : a over SinA = b over SinB

angle : SinA over a = SinB over b