I always forget those triangle formulas and trig identities from the old days of Precal/Trig...
So I say we write some of them down here, you guys can tell me what I'm forgetting.
Heron's Formula- three side lengths known.
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
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Triangle Formulas
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Triangle Formulas
by mathpimp » Sun Jul 01, 2007 2:43 pm
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by stupidityismygam » Sun Jul 01, 2007 2:52 pm
[unparseable or potentially dangerous latex formula] where [unparseable or potentially dangerous latex formula] is the area, [unparseable or potentially dangerous latex formula] is the semiperimeter, and [unparseable or potentially dangerous latex formula] is the inradius
[unparseable or potentially dangerous latex formula] where [unparseable or potentially dangerous latex formula] is the circumradius (follows from the below)
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
thats all i can think of right now
[unparseable or potentially dangerous latex formula] where [unparseable or potentially dangerous latex formula] is the circumradius (follows from the below)
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
thats all i can think of right now
Last edited by stupidityismygam on Sun Jul 01, 2007 3:05 pm, edited 1 time in total.
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by stupidityismygam » Sun Jul 01, 2007 3:02 pm
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stupidityismygam - Ubiquitous Spammer
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by Kurt » Sun Jul 01, 2007 3:53 pm
For a triangle ABC,
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
Also if a circle is inscribed/circumscribed, then
[unparseable or potentially dangerous latex formula] (for s being the semiperimeter)
[unparseable or potentially dangerous latex formula]
And just for kicks, [unparseable or potentially dangerous latex formula]
Those are mostly used on calculator tests though. And unfortunately UIL does nothing with excircles, Ceva's, etc.
[unparseable or potentially dangerous latex formula]
[unparseable or potentially dangerous latex formula]
Also if a circle is inscribed/circumscribed, then
[unparseable or potentially dangerous latex formula] (for s being the semiperimeter)
[unparseable or potentially dangerous latex formula]
And just for kicks, [unparseable or potentially dangerous latex formula]
Those are mostly used on calculator tests though. And unfortunately UIL does nothing with excircles, Ceva's, etc.
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