Equations

Question 1

Area of a rectangle

Answer 1

Length × width

Question 2

Area of a Parallelogram

Answer 2

Base × height

Question 3

Area of a triangle

Answer 3

Base × height ÷ 2

Question 4

Area of trapezium

Answer 4

(A + B) × height (divided by 2)

Question 5

Area of a cricle

Answer 5

Pi × radius²

Question 6

Circumference of a circle

Answer 6

Pi × diameter

Question 7

Speed

Answer 7

Distance ÷ time

Question 8

Density

Answer 8

Mass ÷ volume

Question 9

Pressure

Answer 9

Force ÷ area

Question 10

Sin x°

Answer 10

Opposite ÷ hypotenuse

Question 11

Cos x°

Answer 11

Adjacent ÷ hypotenuse

Question 12

Tan x°

Answer 12

Opposite ÷ adjacent

Question 13

Sine rule

Answer 13

A B C
——— = ——— = ———
Sin A Sin B Sin C

Question 14

Cosine rule

Answer 14

a² = b² + c² - 2bc Cos A

Question 15

Area of triangle (trigonometry)

Answer 15

(1/2) × a × b × SinC

Question 16

Pythagoras theorem

Answer 16

a² + b² + c²

Question 17

Volume of a cuboid

Answer 17

Length × width × height

Question 18

Volume of a cylinder

Answer 18

Pi × radius² × height

Question 19

Volume of a prism

Answer 19

Area of the cross section × length

Question 20

Volume of a pyramid

Answer 20

(1/3) × area of the base × height