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Mathematics 11 Online
OpenStudy (simplymarie_x):

Prove that the sum of the measures of the interior angles of a triangle is 180°. Be sure to create and name the appropriate geometric figures.

OpenStudy (reemii):

|dw:1459017323887:dw| think "alternate angles" and "opposite angles".

OpenStudy (reemii):

|dw:1459017578414:dw|

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