Now that you know the terms for different kinds of triangles based on their sides and angles, see if you can bring all of that knowledge together to analyze some triangles. Review the chart below before beginning the activity--and refer back to it during the activity if you need a reminder.
| Classified by Sides | Classified by Angles |
| Equilateral Triangle A triangle with 3 equal sides |
Acute Triangle A triangle with 3 acute angles. |
| Isosceles Triangle A triangle with 2 equal sides. |
Obtuse Triangle A triangle with 1 obtuse angle. |
| Scalene Triangle A triangle with 0 equal sides. |
Right Triangle A triangle with 1 right angle. |
| Equiangular Triangle A triangle with 3 equal angles. |
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Use the slide show below to practice naming triangles using both of the classifications reviewed above.
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What two terms or labels can you use to name this triangle? One name is based on its sides, and the other is based on its angles.
acute and isosceles What two names can you give the triangle above?
obtuse and scalene What kind of triangle is this one?
right isosceles What two terms describe the triangle above?
equiangular and equilateral |
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