Mathematics ACT Aspire Practice Test 2025 – Complete Study Resource

Question: 1 / 400

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

180 degrees

The sum of the interior angles of a triangle is always 180 degrees. This fact is fundamental in geometry and can be derived from various methods including the use of parallel lines and transversals or by dividing the triangle into two right triangles. When any triangle is drawn, if you draw a line parallel to one side through the opposite vertex, you form alternate interior angles which can help visualize how the angles add up to 180 degrees. This property holds true for all types of triangles, regardless of whether they are acute, obtuse, or right triangles. Understanding this concept is crucial, as it not only applies to triangles but also lays the groundwork for more complex geometric principles.

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90 degrees

360 degrees

270 degrees

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