Equations

Question 1

Inverse Proportion

y=1/x

Answer 1

y=k/x

Question 2

Equation of a straight line

Answer 2

y=mx+c

Question 3

Pressure

Answer 3

Force/Area

Question 4

Direct Proportion

y=x

Answer 4

y=kx

Question 5

Speed

Answer 5

Distance/Time

Question 6

SAS

Answer 6

two sides and the angle in between

Question 7

RHS

Answer 7

right-angle, the hypotenuse and side all match up

Question 8

Sine Rule (ANGLE)

Answer 8

Sine A/a = Sine B/b =

Sine C/c

Question 9

fx

Answer 9

Frequency x Mid-point

(f) (x)

Question 10

Area of a Non-Right Angled Triangle

Answer 10

1/2abSin(c)

Question 11

Density

Answer 11

Mass/Volume

Question 12

Volume of a Pyramid

Answer 12

1/3 x Base Area x Vertical Height

Question 13

ASA

Answer 13

two angles and a corresponding side to match up

Question 14

OR

Answer 14

+

Question 15

AND

Answer 15

X

Question 16

Length of Arc

Answer 16

x/360 x TT x D

Question 17

Area of a Trapezium

Answer 17

1/2(a+b)x h

Question 18

Circumference of a Semi-Circle

Answer 18

TT x D/2 + D

Question 19

Sine Rule (LENGTH)

Answer 19

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

Question 20

Frequency (HISTOGRAMS)

Answer 20

Frequency Density x Class Width

= Area of Bar

Question 21

SSS

Answer 21

three sides are the same

Question 22

Frequency Density

Answer 22

Frequency/Class Width

Question 23

Gradient of a Straight Line

Answer 23

y2-y1/x2-x1

Question 24

Gradient of a Perpendicular Line

Answer 24

-1/m

Question 25

COS A

Answer 25

b2+c2-a2/2bc

Question 26

Surface Area of a Hemisphere

Answer 26

2TTr2 + TTr2

Question 27

Surface Area of a Cylinder

Answer 27

2TTrh + 2TTr2

Question 28

Area of a Sector

Answer 28

x/360 x TTr2

Question 29

Volume of a Hemisphere

Answer 29

2/3 TTr3

Question 30

Volume of a Cylinder

Answer 30

TTr2h

Question 31

Proportional to the Square of x

y=x2

Answer 31

y=kx2

Question 32

Surface Area of a Cone

Answer 32

TTrl + TTr2

Question 33

Cosine Rule

Answer 33

a2=b2+c2-2bcCosA