Question

Triangle ABC is shown below:
Given: ΔABC

Prove: All three angles of ΔABC add up to 180°.

The flowchart with missing reason proves the measures of the interior angles of ΔABC total 180°:

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

Alternate Exterior Angles Theorem

Same-Side Interior Angles

Corresponding Angles Postulate

Alternate Interior Angles Theorem

Answer 1

Please help??

Answer 2

@TheSmartOne thanks.. this is the link..

Answer 3

@hansC are you here please ?

Answer 4

yess.. @jhonyy9

Answer 5

ok- thank s so i like help you - ok. ?

looke please than you check the angles <EBC and <BCA what you see - what was the reason that are congruent ?

Answer 6

alternate ... what ?

Answer 7

do you see it on gif3 have wrote there

Answer 8

alternate interior angles - yes ?

Answer 9

@hansC do you see it ? so than yes what is your opinion about <DBA and <BAC ? not are same angles ?

Answer 10

alternate interior theorem @jhonyy9

Answer 11

yess it should be it cause its not the same.. @jhonyy9

Answer 12

but than you check them are the same angles alternate interior - so this is the missed part sure

Answer 13

ohh okayy.. thank you so much @jhonyy9

Answer 14

np

was my pleasure and any time

bye bye