maths revision by xhuskyhoundx

Pythagoras theorem

huskyhound14 — 2017-03-14 19:41:43 UTC

c is always the hypotenuse.

you can find the other sides by rearranging the equation.

Trigonometery

huskyhound14 — 2017-03-14 19:41:52 UTC

Cosine Rule =
a² = b² + c² - 2bc cos A
a = square root of a²Sine Rule =

Area using sine =
½ absinC

Iteration

huskyhound14 — 2017-03-14 19:41:56 UTC

n + 1 < - Next value

x
n < - Previous value

Divergent - No pattern to numbers. Numbers get too big.

Convergent - Numbers eventually converge to a given value.

Pi and circles

huskyhound14 — 2017-03-14 19:43:18 UTC

Area = πr(adius)^2
Circumference = πD(iameter)

SOH CAH TOA

huskyhound14 — 2017-03-14 19:43:40 UTC

sin = ^opposite / _hypotenuse

cos = ^adjacent / _hypotenuse

tan = ^opposite / _{adjacent

When you are trying to find a side of a triangle when you have a side and an angle we use SOHCAHTOA.}

huskyhound14 — 2017-03-14 19:49:46 UTC

Finding the opposite

huskyhound14 — 2017-03-14 19:54:47 UTC

First we need to find out what we need to use SIN. this is because we have the hypotenuse but we need to find the opposite.

Sin 30 = BC / 7
we don't have the opposite so we have to re arrange it

Sin 30 x 7 = BC (opposite)

Finding the Adjacent

huskyhound14 — 2017-03-14 20:07:15 UTC

For this we have to use TAN because we have the opposite and we have to find the adjacent.

tan 50 = PQ / 4

tan 50 x 4 = PQ (Adjacent)

Finding the Hypotenuse

huskyhound14 — 2017-03-14 20:13:39 UTC

For this triangle we have to use COS

we multiply both sides by YZ

YZ x cos25 = 5

Now we can divide both sides by cos25:

http://www.bbc.co.uk/schools/gcsebitesize/maths/geometry/trigonometryrev3.shtml

huskyhound14 — 2017-03-14 20:16:15 UTC

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Frequency Polygons

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Moving Averages

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Simultaneous Equations

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Solving Quadratic Equation

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huskyhound14 — 2017-03-14 22:50:54 UTC

give me ur bbm

mcnoobe24 — 2017-03-15 16:48:33 UTC

Histograms

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Interquartile Range

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Cumulative Frequency

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Box and Whisker Plots

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Surds

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Averages in a table

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Class Interval

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Quadratic Formula

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Indices Rules

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Shape Area Formulae

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Ratios

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darthpingu9 — 2017-03-23 19:57:22 UTC

𝐰𝐡𝐨𝐦𝐬𝐭'𝐝'𝐯𝐞

mcnoobe24 — 2017-03-23 19:57:56 UTC

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Circle Theorems

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Vectors

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xD

leave this here for scrolling space

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