Classifying Triangles
By angles: all acute = acute triangle, one 90° = right triangle, one over 90° = obtuse triangle
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By angles: all acute = acute triangle, one 90° = right triangle, one over 90° = obtuse triangle
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Triangles come in three types by their angles: acute triangles have all three angles under 90°; right triangles have exactly one 90° angle; obtuse triangles have one angle over 90°. Every triangle has at least two acute angles, so the key is to find the largest angle.
A random triangle appears — read its three angles and decide whether it is acute, right, or obtuse. A correct answer lights up a green glow box and explains the reason.