Video: Identifying the Type of a Triangle given the Measures of Its Angles

What do we call a triangle that has angles 80°, 68°, and 32°?

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Video Transcript

What do we call a triangle that has angles 80 degrees, 68 degrees, and 32 degrees?

If we’re going to name a triangle by its angles, we have three options. An acute-angled triangle, a right-angled triangle, or an obtuse-angled triangle. In an acute-angled triangle, all angles are less than 90 degrees. In a right-angled triangle, one angle equals 90 degrees. And in an obtuse-angled triangle, one angle is greater than 90 degrees. Our triangle is an angle 80 degrees, an angle 68 degrees, and an angle 32 degrees. Each of these angles are less than 90 degrees. And so we confirm that we would call this triangle an acute-angled triangle.

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