anonymous
  • anonymous
I need help with proving that the measures of the interior angles of a triangle is 180 degrees.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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amistre64
  • amistre64
draw a parallel line thru one of the vertexes, that is parallel to the other side ...
amistre64
  • amistre64
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anonymous
  • anonymous
I have gotten that far.

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amistre64
  • amistre64
what are angles called so that we can equate them like i did?
amistre64
  • amistre64
and what is the measure in degrees of a straight line?
anonymous
  • anonymous
alternate interior?
anonymous
  • anonymous
180 degrees for a straight line.
amistre64
  • amistre64
alt interior yes; that allows us to move a and c to the top
amistre64
  • amistre64
now a+b+c = 180 by some straight line property
anonymous
  • anonymous
What do you mean by straight line property?
amistre64
  • amistre64
i mean, that i can never remember what they call these things .... the names should be better suited to you since you are fresh in the course.
amistre64
  • amistre64
straight angle definition maybe?
amistre64
  • amistre64
since a,b,c add create a straight line, then they add up to 18o degrees,
anonymous
  • anonymous
but is that enough for this proof?
amistre64
  • amistre64
should be what was it we were trying to prove?
anonymous
  • anonymous
That the sum of the interior angles of a triangle are 180 degrees.
amistre64
  • amistre64
we show that the three angles of a triangle form a straight line ... and thereby have a sum of 180
amistre64
  • amistre64
thats proof enough for me
anonymous
  • anonymous
Thanks.
amistre64
  • amistre64
good luck
anonymous
  • anonymous
I need more help with this

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