Formulae Flashcards by two direction | Brainscape

Q

Sum of interior angles

A

180x(n-2)

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Q

Area of rectangle

A

bh

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Q

Area of triangle

A

1/2 bh

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Q

Area of parallelogram

A

bh

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Q

Area of trapezium

A

1/2(a+b)h

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Q

Surface area of cuboid

A

Sum of all faces

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Q

Volume of a prism

A

Cross section x length

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Q

Circle circumference

A

π x d

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Q

Area of a circle

A

πr^2

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Q

Length of an arc

A

(sector angle / 360) x 2πr

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Q

Sector area

A

(sector angle / 360) x πr^2

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Q

Curved surface area of cylinder

A

2πrh

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Q

Volume of a cylinder

A

πr^2h

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Q

Volume of a cone

A

1/3πr^2h

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Q

Curved surface area of cone

A

πrl

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Q

Volume of sphere

A

4/3πr^3

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Q

Surface area of sphere

A

4πr^2

Q

Hypotenuse of a right angled triangle (Pythagoras’ Theorem)

A

a^2 + b^2 = c^2

Q

Distance between points

A

root of ((x2 - x1)^2 + (y2 - y1))

Q

sine 0️⃣

A

opposite / hypotenuse

Q

cos 0️⃣

A

adjacent / hypotenuse

Q

tan 0️⃣

A

opposite / adjacent

Q

opposite =

A

sin x hypotenuse

Q

adjacent =

A

cos x hypotenuse

Q

hypotenuse =

A

adjacent x tan

Q

AX x BX =

A

CX x DX

Q

Median position

A

(n+1) / 2

Q

Frequency density =

A

frequency / class width

Q

Lower quartile position

A

1/4(n+1)

Q

Upper quartile position

A

1/4(n+1)

Q

Interquartile range

A

upper - lower

Q

Probability

A

number of favourable outcomes / total number of possible outcomes

Q

P(a does not happen)

A

P(a or b) = P(a) + P(b)

Q

Average speed

A

total distance / total time

Q

Density

A

mass / volume

Q

Perfect square

A

x^2 + 2ax + a^2 = (x+a)^2

Q

Completing the square

A

(x+a)^2 + b

Q

Quadratic equation formula

A

x = (-b +or- root of b^2 - 4ac) / 2a

Q

Sine rule

A

a/sinA = b/sinB and flipped

Q

Cosine rule

A

a^2 = b^2 + c^2 - 2bc cosA
cosA = (b^2 + c^2 - a^2) / 2bc

Q

Area of a triangle using trigonometry

A

1/2ab sinC

Q

Freebie

A

Wheeeeee