Formulas Flashcards

1
Q

Circumference of a circle

A

C = 2πr

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2
Q

Length of an Arc

A

L = θ/360 × 2πr

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3
Q

Perimeter of a Sector

A

P = θ/360 × 2πr + 2r

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4
Q

Area of Triangle

A

1/2 × bh

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5
Q

Area of a Parallelogram

A

A = bh

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6
Q

Area of a Trapezium

A

A = 1/2 × (a + b) × h

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7
Q

Area of a Rhombus or Kite

A

A = 1/2 × 𝑥y

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8
Q

Area of a Circle

A

A = πr^2

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9
Q

Area of a Sector

A

A = θ/360 × πr^2

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10
Q

SA of Cylinder

A

SA = 2πrh + 2πr^2

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11
Q

Volume of Cylinder

A

V = πr^2 × h

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12
Q

Volume of a Prism

A

V = Ah

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13
Q

Volume of a Pyramid

A

V = 1/3 × Ah

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14
Q

Volume of a Sphere

A

V = 4/3 × πr^3

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15
Q

SA of Sphere

A

SA = 4 × πr^2

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16
Q

Percentage Error

A

% Error = absolute/measurement × 100%

17
Q

Absolute Error

A

Abs Error = 1/2 × smallest unit

18
Q

1 calorie = ?kj

A

1 calorie = 4.184kj

19
Q

Trapezoidal Rule

A

h/2 × (df + dl)

20
Q

Cone

A

1/3 × πr^2 × h

21
Q

Straight Line Depreciation

A

Depreciation = S = Vo - Dn

22
Q

Outliers

A

Outliers = Q1 - 1.5 × IQR

and Q3 + 1.5 × IQR

23
Q

Simple Interest

A

I = P × R × N

24
Q

Gradient

A

m = Rise / run or y2 - y1/𝑥2 - 𝑥1

25
Q

Equation of a Straight Line

A

y = m𝑥 + c

26
Q

1 metre^3

A

1m^3 = 1 kL or 1000 L