Need To Know Formulae Flashcards by Sebastian Shen Ridley

Q

Area Rectangle

A

Length x width

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Q

Area Parallelogram

A

Base x hight

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Q

Area Triangle

A

1/2 base x hight

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Q

Area Trapezium

A

Half the sum of the parallel sides times the distance between them

1/2 ( length a + length b) X hight

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Q

Volume Cuboid

A

Hight x length x width

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Q

Volume Prism

A

Area of cross section x length

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Q

Volume Cylinder

A

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Q

Volume Pyramid

A

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Q

Cylinder (curved surface area)

A

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Q

Surface area prism

A

Front + back + rectangular sides

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Q

Surface area Pyramid

A

Base + triangular sides

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Q

Circle circumference

A

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Q

Circle area

A

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Q

Right angled triangles Pythagoras

A

A squared + B squared = C squared

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Q

Trigonometry sin

A

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Q

Trigonometry cos

A

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Q

Trigonometry tan

A

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Q

Quadratic equations

A

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Q

Compound measurements speed

A

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Q

Compound measures density

A

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Q

Compound measures pressure

A

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Q

Estimate for the mean

A

Sum of mid point x frequency
——————————————
Total frequency

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Q

Volume of hemisphere

A

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Q

Curved surface area of a hemisphere

A

Volume of a cone

Curved surface area of a cone where L is the slanted Hight

Volume of a sphere

Surface area of a sphere

Area of a sector

Arch length of sector

Perimeter of sector

Triangles area

1/2absin( c )

Sum of all exterior angle in polygons

360

Sum of all the interior angles polygon

180 x n-2 N=number of sides

Exterior angles regular polygons

360/N

Centre angle Refular polygon

360/N

Interior angle methods 1 RP

180(N-2) / N Gives 1 angle

Interior method 2

Ext + int = 180

Triangle 1 exterior of a regular shape

120

1 int angle reg triangle

60

Sum exterior quadrilateral

360

Sum int quad

360

Sum ex angles pentagon

360

1 ext RS pentagon

72

1 int reg shape

108

Sum int hexagon

720

1 int RS hexagon

120

Sum extra angles heptagon

360

Sum interior angles heptagon

900

1 exterior angle RS octagon

45

1 int angle RS octagon

135

Sum of the exterior angles nonagon

360

Sum int angles nonagon

1260

Decagon 1 interior angle RS

144

Unagon sum interior angles

1620

Dodecagon sum exterior angles

360

Dodecagon 1 exterior angle RS

30

Sum interior angles dodecagon

1800

1 interior angle reg shape dodecagon

150