Important Formulae

Question 1

Recite the quadratic formula

Answer 1

-b ± √b² - 4ac
all over
2a

(when ax² + bx + c)

Question 2

Recite the Sine rule for finding a missing side

Answer 2

a / sin(A) = b / sin(B) = c / sin(C)

Question 3

Recite the Sine rule for finding a missing angle

Answer 3

Sin(A) / a = Sin(B) / b = Sin(C) / c

Question 4

Recite the Cosign rule for a missing side

Answer 4

a² = b² + c² - 2bc(Cos(A))

Question 5

Recite the Cosign rule for a missing angle

Answer 5

A = cos⁻¹ ((b² + c² - a²) / 2bc)

Question 6

Recite the Trigenometric Area of a Triangle formula

Answer 6

1/2 x ab x Sin C

Question 7

Recite the equation for frequency density

Answer 7

frequency density = frequency / class width