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thaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaank

 Oct 17, 2018
edited by Guest  Oct 17, 2018
 #1
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Angles DAB  and CAB  are supplementary  [sum to 180]

By the Exterior Angle Theorem,  angle DAB =   angle ABC + angle ACB

Substituting...we have that

angle ABC + angle ACB  + angle CAB  = 180

And these are the 3  interior angles in the triangle

 

cool cool cool

 Oct 17, 2018
 #2
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+1

:D helpful, thank you

Guest Oct 17, 2018

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