How many degrees are in the sum of the interior angles of a triangle?

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Multiple Choice

How many degrees are in the sum of the interior angles of a triangle?

Explanation:
The sum of the interior angles of a triangle is 180 degrees. A clear way to see why is to draw a line through one vertex parallel to the opposite side. The other two interior angles of the triangle become corresponding angles along that parallel line, so all three interior angles line up to form a straight angle. A straight angle is 180 degrees, so the three interior angles add up to 180. The other options don’t fit because they would not add up to a straight angle (270), would be too small (90), or correspond to a figure with four sides (360).

The sum of the interior angles of a triangle is 180 degrees. A clear way to see why is to draw a line through one vertex parallel to the opposite side. The other two interior angles of the triangle become corresponding angles along that parallel line, so all three interior angles line up to form a straight angle. A straight angle is 180 degrees, so the three interior angles add up to 180. The other options don’t fit because they would not add up to a straight angle (270), would be too small (90), or correspond to a figure with four sides (360).

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