PLEASE HELP
The figure below shows a circle with two chords GF and DE intersecting at point L.

Roy took the measurements of the line segments and wrote them down as shown.

Segment GL is 3.7 cm, segment LF is 1.2 cm, segment DL is 1.8 cm, and segment LE is 2.6 cm.

Describe the method you use to prove that Roy took incorrect measurements. Use geometric theorems to write a two-column proof.

Question

PLEASE HELP
The figure below shows a circle with two chords GF and DE intersecting at point L.



Roy took the measurements of the line segments and wrote them down as shown.

Segment GL is 3.7 cm, segment LF is 1.2 cm, segment DL is 1.8 cm, and segment LE is 2.6 cm.

Describe the method you use to prove that Roy took incorrect measurements. Use geometric theorems to write a two-column proof.

anonymous · Answer

attachment

amistre64 · Answer

each chord is split in 2 pieces, if the product of the pieces of one equal the product of the pieces of the other, then they measurements we good

anonymous · Answer

thank youu, its saying to prove why they would be wrong in their measurements though :(

amistre64 · Answer

yeah, theres a thrm that i never remember a proof for that goes|dw:1344889286546:dw|a*b=c*d

amistre64 · Answer

if his measurements dont fit, then they is wrong

amistre64 · Answer

but how far do we have to go before we are simply reinventing the wheel to prove something?

amistre64 · Answer

perhaps the thrm is located in your material for you to reference; and say:  by such and such thrm, this is bad measures

anonymous · Answer

oh so you're not for sure that the theorem you wrote is right?

amistre64 · Answer

lol, the thrm is correct; i just never remember the steps that were used to prove the thrm itself.

anonymous · Answer

ohhhhh lol okay then thanks so much thats my last problem on my exam, just trying to get it finished

amistre64 · Answer

is the question asking you to reinvent the thrm?  or to use the thrm to prove the problem false?

anonymous · Answer

lemmme check

anonymous · Answer

yeah, it says to use the theorems for writing the two column proof which i guess means rewriting them

amistre64 · Answer

http://www.cemc.uwaterloo.ca/contests/euclid_eWorkshop/eew_ps6.pdf second page is the crossing chords

anonymous · Answer

this is like heiroglyphics to me

amistre64 · Answer

are you trying to write a 2 column proof?

anonymous · Answer

yes, with the theorems

amistre64 · Answer

are there parts filled in, a list of thrms to pick from, something to go by perchance?

amistre64 · Answer

or is it a blank slate and you have to reconstruct it

anonymous · Answer

blank. you have to create it yourself

anonymous · Answer

which im not sure how to do this in this situation -.- lol

amistre64 · Answer

|dw:1344889922408:dw|

well, they do form similar triangles