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# Need some help with Geometry!

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Thanks!

Oct 20, 2019

#1
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What does [AEB]  mean?   I have not seen that notation before.

These two triangles are similar.

Can you work out why.

Hint;   consider the three angles on each one.

Oct 20, 2019
#2
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Notice that AC and BD intersect each other at E

So,

using our knowledge of V.O.A (Vertical opposite angles)

We know that AEB = DEC (Angle)

We already know AEB=50, therefore, CED=50

With more proof,

Since, m(B)=m(C)

since, AC intersect DB at point E

Therefore m(AEB)=M(DEC)=50

Therefore, M(EAB)=m(EDC)

We deduce that triangle AEB is similar to triangle DEC

we can also deduce that EB/EC = ED/EA = AB/DC

so 5/4=ED/EA =AB/DC

Oct 20, 2019
#3
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Why didn't you answer my question guest?

Melody  Oct 21, 2019
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Hi,

I am another guest (The one who answered but not the one who wrote the question)

What does [AEB] mean?

Well I think it is the angle (written mathematical wrong , but it can't be a side or anything else except M(

Guest Oct 21, 2019
#5
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Thanks guest, maybe you are right.

Melody  Oct 21, 2019
#6
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My guess, Guests, and Melody, is that it's the area of the triangle.

Oct 21, 2019
edited by Tiggsy  Oct 21, 2019
#7
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Thanks Tiggsy that thought had crossed my mind too but I did not attempt to think it through.

Melody  Oct 21, 2019