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Mathematics 7 Online
Shantelsurry:

Given: segment AB || segment DE, C is the midpoint of segment DB. Prove: ΔABC ≅ ΔEDC Fill in the missing statement for the proof.

Aricuzyas:

Hmmmm...... I'm not that great at math lol. Excuse my long thinking..

Angle:

Hello @Shantelsurry and Welcome to QuestionCove :) The first step towards a geometry problem like this is to try to draw a picture that represents the situation

Aricuzyas:

\(\color{#0cbb34}{\text{Originally Posted by}}\) @Angle Hello @Shantelsurry and Welcome to QuestionCove :) The first step towards a geometry problem like this is to try to draw a picture that represents the situation \(\color{#0cbb34}{\text{End of Quote}}\) Lol thanks for coming in, I was afraid I wasn't going to be able to help the person.

Angle:

|dw:1613089795403:dw|

Angle:

Here is a quick drawing that I think represents the information that we have been given

Shantelsurry:

Yes

Shantelsurry:

A) ∠B ≅ ∠E B) ∠A ≅ ∠E C) ∠A ≅ ∠D D) ∠C ≅ ∠E

jimthompson5910:

@Angle your drawing is a bit incorrect It says `C is the midpoint of segment DB`, so the drawing should show that DC = CB

Angle:

AHH Thanks for pointing that out @jimthompson5910

jimthompson5910:

No problem

Angle:

|dw:1613090029539:dw|

Angle:

@Shantelsurry First, why would the angle ACB and angle DCE be equal to each other?

Shantelsurry:

It’s angle abc not acb

Angle:

Why would the angles I just marked be equal to each other? |dw:1613090232516:dw|

Angle:

https://cdn.thinglink.me/api/image/567720530254233600/1240/10/scaletowidth vertical angles are always going to be equal to each other

Angle:

Now, in this problem we already know that we have a pair of Sides that are equal and a pair of Angles that are equal. We would like another pair of Angles in order to use a rule such as AAS or ASA to prove triangle congruency

Shantelsurry:

Statements Reasons segment AB || segment DE given C is the midpoint of DB given segment DC ≅ segment BC definition of midpoint ∠B ≅ ∠D alternate interior angles of || lines are ≅ alternate interior angles of || lines are ≅ ΔABC ≅ ΔEDC AAS Theorem

Angle:

ah I see it is saying that you need another pair of Alternate Interior Angles

Shantelsurry:

Yes

Angle:

<B and <D are already used what is another possible pair of angles that would be Alternate interior angles?

Shantelsurry:

a and E

Angle:

you got it

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