Triangle formulas Flashcards
1
Q
What equation would you use if you had two angles and one side, or two sides and one angle? (Sine rule)
A
Sin(a) / A = Sin(b) / B
2
Q
What is the formula for the area of a triangle?
A
1/2absin(C)
3
Q
How would you use the sign rule if you wanted to find an angle?
A
Whatever you want to find goes on top eg Sin(A) / a = Sin(B) / b
4
Q
What is the cosine rule?
A
a² = b² + c² - 2bcCos(A)
5
Q
What is the formula to find an angle using the cosine rule?
A
Cos(A) = b² + c² - a² / 2bc
