Question

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F.1 Classify triangles TNN
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A triangle has angle measurements of 42°, 128°, and 10°. What kind of triangle is it?
acute
right
obtuse

Answer 1

A triangle with angle measurements of 42°, 128°, and 10° is an obtuse triangle.

Step-by-step explanation:

A triangle with angle measurements of 42°, 128°, and 10° is an obtuse triangle.

To classify a triangle, we use the sum of its angles. In a triangle, the sum of the angles is always 180°. In this case, 42° + 128° + 10° = 180°, so it is a valid triangle.

Since one angle (128°) is greater than 90°, the triangle is obtuse. An obtuse triangle has one angle greater than 90°.