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Drawing/Labelling Geometry shapes.

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Manager
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Joined: 09 Dec 2009
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Drawing/Labelling Geometry shapes. [#permalink] New post 06 Mar 2010, 09:11
Real basic question.

When a Q says triangle ABC or quadrilateral ABCD without giving a diagram how do you label your own?

Ie. I usually, say for a quadrilateral, start with A in the bottom left hand corner and label sequentially going counter clockwise...

D C

A B

Is this correct? If not please fill me in on the standard protocol. Also when is asks for angle BCD? which point is it closes to?

Say angle BCD was identified as 70 degrees, I would label...

D C 70

A B

Doesthis make sense?

Can someone shed some light?
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Round 1: 05/12/10 handling-a-grenade-thesituation-s-official-debrief-94181.html

Round 2: 07/10/10 - This time it's personal.

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Re: Drawing/Labelling Geometry shapes. [#permalink] New post 06 Mar 2010, 10:01
Your labeling techniques are correct. Which ever direction you go, when given in the question is a quadrilateral ABCD, then you have to label the corners of the quadrilateral in the exact cyclic order and not haphazardly like some

B A or C A

D C B D

Make sure you draw some lines that connect those corners, your drawing will be much more realistic to represent a quadrilateral and will help you quickly recognize the internal angles faster. And thus coming to angles, Angle BCD is the internal angle of the quadrilateral, and prefer to write the number of degrees inside the quadrilateral. You might as well draw a tiny arc around the angle, inside the quadrilateral, connecting BC and CD. When you'd like to represent two such angles to hold same values, you can also draw concurrent arcs as explained above near the two angles that are supposedly equal.

Hope that helps with your question.
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Manager
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Re: Drawing/Labelling Geometry shapes. [#permalink] New post 06 Mar 2010, 11:15
Stinson you magnificent bastard you've done it again!

So to confirm, when a Q states angle ABC is x degrees you coordinate x degrees being by point B on the diagram? does that make sense?

This geomerty stuff is rattling my cage!!
_________________

G.T.L. - GMAT, Tanning, Laundry

Round 1: 05/12/10 handling-a-grenade-thesituation-s-official-debrief-94181.html

Round 2: 07/10/10 - This time it's personal.

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Schools: LBS, INSEAD, IMD, ISB - Anything with just 1 yr program.
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Kudos [?]: 101 [0], given: 22

Re: Drawing/Labelling Geometry shapes. [#permalink] New post 08 Mar 2010, 16:06
"TheSituation", whatever your situation is, learn to suit up!!!! Suits are cool, suits are elegant, exhibit`e!!!

And coming to your question, yes, that is right. Represent your angle x inside or the outside of a vertex accordingly, just don't confuse which side is the actual angle referring to.
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Re: Drawing/Labelling Geometry shapes. [#permalink] New post 11 Mar 2010, 06:32
BarneyStinson wrote:
"TheSituation", whatever your situation is, learn to suit up!!!! Suits are cool, suits are elegant, exhibit`e!!!


Stinson, thanks for the reply.

These HIMYM quotes are gold.

The real Barney would stop talking geometry and start being awesome instead tho!!
_________________

G.T.L. - GMAT, Tanning, Laundry

Round 1: 05/12/10 handling-a-grenade-thesituation-s-official-debrief-94181.html

Round 2: 07/10/10 - This time it's personal.

Re: Drawing/Labelling Geometry shapes.   [#permalink] 11 Mar 2010, 06:32
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