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Geometry Formulas Practice Sheet

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Geometry Formulas Practice Sheet [#permalink] New post 26 Jul 2009, 10:36
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Hi all,

I created a template that gather all the geometry formulas that appear on the GMAT (if i missed any please tell!). I use it every week in order to ensure that I remember all of them.

I think it could be helpful for some of you so I decided to share.

The TEMPLATE is the one for practice.

Good luck!
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Re: Geometry Formulas Practice Sheet [#permalink] New post 26 Jul 2009, 20:33
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Great resource :!:

Thank you!

I have added this post to the Math Tips: new-to-the-math-forum-please-read-this-first-77764.html
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Re: Geometry Formulas Practice Sheet [#permalink] New post 07 Jan 2010, 09:47
Sorry, but on page 2 there is a misprint:
in Arc Measure (Intersecting Secants/Tangents) It must be the difference between arcs measures of AD and BD.
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Re: Geometry Formulas Practice Sheet [#permalink] New post 11 Sep 2010, 11:27
Now, what does this mean:

Area of Isosceles Triangle = 1/2[(leg)^2]
(from Geometry Formulas.pdf)

I haven't been able to give myself any convincing explanation of this formula...
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Last edited by rishabhsingla on 05 Oct 2010, 11:03, edited 1 time in total.
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Re: Geometry Formulas Practice Sheet [#permalink] New post 11 Sep 2010, 11:42
rishabhsingla wrote:
Now, what does this mean:

Area of Isosceles Triangle = 1/2[(leg)^2]
(from Geometry Formulas.pdf)

I haven't been able to give myself any convincing explanation of this formula...


Well that's because it's not true.

It should be area of isosceles right triangle = 1/2*(leg)^2, simply because area of right triangle equals to 1/2*leg1*leg2, and since in isosceles right triangle leg1=leg2, then this formula becomes area=1/2*(leg)^2.
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Re: Geometry Formulas Practice Sheet [#permalink] New post 20 Apr 2011, 19:47
Thanks for this memory sheet, very useful!


However I believe some formulas, details might be added...

Angles of a polygons (n-2)* 180, angles inscribed in a circle (compared to central angle there a section about it in the VERITAS Prep book)


Also I did not see two real IMPORTANT triangles sides ratio:

3:4:5
5:12:13

Good you put the formula for the equilateral triangle (which is not given in the OG and allow you to gain so much time)

I found formula I did not know! :-) Thank you for sharing
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Re: Geometry Formulas Practice Sheet [#permalink] New post 23 Apr 2011, 13:59
I'd also add one more element to Coordinate geometry. The coordinates of a point P on line joining two points A(x1,y1) and B(x2,y2) such that PA:PB is in the ration m:n would be ((mx2+nx1)/(m+n),(my2+ny1)/(m+n)).
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Re: Geometry Formulas Practice Sheet [#permalink] New post 04 Jan 2012, 07:33
Could anybody please rewrite and explain the formulas for arc measure( intersecting chords) and arc measure (intersecting secants/tangents)?
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Re: Geometry Formulas Practice Sheet [#permalink] New post 13 Nov 2012, 11:06
In the formula sheet.... Arc Measure (Intersecting Secants/Tangents) [2] formula shouldn't it be angle C = AD-BD/2 since C is external point.
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Re: Geometry Formulas Practice Sheet [#permalink] New post 23 Dec 2012, 07:45
Re: Geometry Formulas Practice Sheet   [#permalink] 23 Dec 2012, 07:45
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