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Geometry

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mnemonic devices for geometry!

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pi
Value Of Pi (π) Count the number of letters in each word: Pi (π) to 7 decimal places: (Word lengths are digits) May I have a large container of coffee? 3.1415926 Pi (π) to 10 decimal places: (Word lengths are digits) May I have a large container of coffee ready for today? 3.1415926535 Pi (π) to 12 decimal places: (Word lengths are digits) See, I have a rhyme assisting my feeble brain, its tasks oft-times resisting. 3.141592653589 Pi (π) to 30 decimal places: (Word lengths are digits) Now I, even I, would celebrate In rhymes unapt, the great Immortal Syracusan, rivaled nevermore, Who in his wondrous lore, Passed on before, Left men his guidance How to circles mensurate. and another one also to 30 decimal places (written by Michael Shapiro)

Formula For The Area Of A Trapezoid

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b1, b2 - the lengths of the two bases a - altitude of the trapezoid area=a(b1+b2/2)

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Pythagorean Theorem

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For use with triangles, the theorem is that A Squared + B squared = C squared. C represents the Hypotenuse and A/B represent the other two legs.

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Symmetry

Symmetry:

In a plane, a figure has symmetry if there is an isometry, other than the identity, that maps the figure to itself.

Line Symmetry:

For each figure there is a line of symmetry such that the reflection
maps the figure onto itself.

Point Symmetry:

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