Ontario Mathematics Proficiency Practice Test

Question: 1 / 400

What is the sum of the interior angles of a triangle?

90 degrees

180 degrees

The sum of the interior angles of a triangle is always 180 degrees. This is a fundamental property of triangles in Euclidean geometry. Regardless of the type of triangle (whether it is scalene, isosceles, or equilateral), when you add the measures of the three interior angles together, they will always total 180 degrees.

This property can be understood better by visualizing a triangle and drawing a line parallel to one of its sides. The angles formed with the parallel line and the other two sides illustrate that the angles on a straight line sum to 180 degrees. This reinforces the idea that the interior angles of any triangle will always be equal to 180 degrees.

In contrast, the other options (90 degrees, 270 degrees, and 360 degrees) do not represent the sum of the interior angles of a triangle and thus do not hold true in any triangle configuration.

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270 degrees

360 degrees

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