None of the triangles listed has two equal base angles or two equal side lengths, therefore: D. No triangle is isosceles.
Properties of an Isosceles Triangle
- An isosceles triangle has two base angles having equal angle measure.
- The side lengths that are opposite each of the equal base angles are also congruent to each other.
Thus, none of the triangles listed has two equal base angles or two equal side lengths, therefore: D. No triangle is isosceles.
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