Formulas

Question 1

What is the quadratic formula?

Answer 1

x= -b ± square root of: b2 -4ac all divided by 2a

Question 2

Area of triangle (2)

Answer 2

half base x perpendicular height

half ab x sin of angle between

Question 3

Cosine rule?

Answer 3

cos(A) = b squared + c squared - a squared all over 2bc

Question 4

Sine rule?

Answer 4

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

Question 5

sin (x) =?

Answer 5

opposite divided by hypotenuse

Question 6

cos (x) =?

Answer 6

adjacent divided by hypotenuse

Question 7

tan (x) =?

Answer 7

opposite divided by adjacent

Question 8

Area of parallelogram?

Answer 8

base x perpendicular height

Question 9

Area of trapezium?

Answer 9

1/2 (a+b)h where a and b are parallel sides and h is the perpendicular height

Question 10

Area of a circle?

Answer 10

pi x r squared

Question 11

Circumference of a circle?

Answer 11

2x pi x r

Question 12

Area of a sector?

Answer 12

angle divided by 360 x area of circle

Question 13

length of an arc?

Answer 13

angle divided by 360 x circumference

Question 14

Speed =?

Answer 14

distance over time

Question 15

Density =?

Answer 15

mass over volume

Question 16

Pressure=?

Answer 16

force over area

Question 17

Volume of a prism?

Answer 17

area of cross section x length

Question 18

volume of a cylinder?

Answer 18

pi r squared h

Question 19

volume of a pyramid?

Answer 19

1/3 x base area x h

Question 20

Volume of a sphere?

Answer 20

4/3 pi r cubed

Question 21

Volume of a cone?

Answer 21

pi r squared h divided by 3

Question 22

Curved SA of cone?

Answer 22

pi rl (l = slant height)