The sum of the interior angles of a triangle equals 180 degrees.

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Multiple Choice

The sum of the interior angles of a triangle equals 180 degrees.

Explanation:
The total of the three interior angles in any triangle forms a straight angle, measuring 180 degrees. A clear way to see this is to draw a line through one vertex parallel to the opposite side. The angles at the other two vertices become equal to the two angles formed with that line, so when you place all three interior angles along this straight line, they fill the 180-degree straight angle. Therefore, A + B + C equals 180 degrees. The other options don’t fit because 90, 360, or 270 degrees don’t correspond to a straight-line sum of these three angles.

The total of the three interior angles in any triangle forms a straight angle, measuring 180 degrees. A clear way to see this is to draw a line through one vertex parallel to the opposite side. The angles at the other two vertices become equal to the two angles formed with that line, so when you place all three interior angles along this straight line, they fill the 180-degree straight angle. Therefore, A + B + C equals 180 degrees. The other options don’t fit because 90, 360, or 270 degrees don’t correspond to a straight-line sum of these three angles.

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