Formulas

Question 1

What is the formula for solving quadratics?

Answer 1

x = -b+-{b^2 - 4ac / 2a EG 5x^2 + 3x - 4

Question 2

What is the formula of the arc length?

Answer 2

theta/360 x d x pi

Question 3

What is the formula of the area of a sector?

Answer 3

theta/360 x pi x r^2

Question 4

What is the formula for interest?

Answer 4

amount burrowed x interest rate x years / 100

Question 5

What is the Sine rule?

Answer 5

a/SinA = b/SinB = c/SinC

Question 6

What is the Cosine rule (for sides)?

Answer 6

a^2 = b^2+c^2 - 2bc cos(A
b^2 = a^2+c^2 - 2bc cos(B
c^2 = a^2+b^2 - 2bc cos(C

Question 7

What is the Cosine rule (for angles)?

Answer 7

cos(A = b^2+c^2-a^2 / 2bc

cos(B = a^2+c^2-b^2 / 2ac

cos(C = a^2+b^2-c^2 / 2ab

Question 8

How to find the area of a triangle without a height?

Answer 8

1/2 x side x side x sin(angle between them

Question 9

How to find the volume of a cylinder?

Answer 9

pi x r^2 x h

Question 10

How to find the volume of a triangular prism?

Answer 10

w x h / 2 x L

Question 11

How to find the volume of a pyramid?

Answer 11

1/3 x base area x h

Question 12

How to find the volume of a cone?

Answer 12

1/3 x pi x r^2 x h

Question 13

How to find the area of a triangle?

Answer 13

1/2 (hxb)

Question 14

How to find the area of a parallelogram?

Answer 14

a x b

Question 15

How to find the area of a trapezium?

Answer 15

1/2 x h(a+b)

Question 16

How to find the area of a kite?

Answer 16

1/2 (w x h)