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Mathematics 17 Online
OpenStudy (anonymous):

Triangle ABC is shown below.

OpenStudy (akashdeepdeb):

I don't see it below. :O

OpenStudy (anonymous):

need help?

OpenStudy (anonymous):

OpenStudy (anonymous):

Given: ΔABC Prove: All three angles of ΔABC add up to 180°. The flow chart with missing reason proves the measures of the interior angles of ΔABC total 180°.

OpenStudy (anonymous):

OpenStudy (anonymous):

Which reason can be used to fill in the numbered blank space?

OpenStudy (anonymous):

let me try

OpenStudy (anonymous):

- Alternate Exterior Angles Theorem - Same-Side Interior Angles - Corresponding Angles Postulate - Alternate Interior Angles Theorem

OpenStudy (anonymous):

@Darius25

OpenStudy (anonymous):

wow sorry dont know wat grade is this

OpenStudy (akashdeepdeb):

Is it given that AC is parallel to DE? :D

OpenStudy (anonymous):

I think so? Is that what the ll means?

OpenStudy (akashdeepdeb):

It means that they are parallel! :D

OpenStudy (anonymous):

Okay! So would it be C?

OpenStudy (akashdeepdeb):

I'll give you a hint. |dw:1393597355405:dw| |dw:1393597428104:dw|

OpenStudy (anonymous):

Now I'm think it's either A or D

OpenStudy (akashdeepdeb):

It is D! :D In your diagram if you notice the triangle and the line form alternating angles. Understand? :)

OpenStudy (anonymous):

Ah I see I now! Thank you so much! Can I tag you in one more?

OpenStudy (akashdeepdeb):

Try it first.

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