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4
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a triangle with three congruent sides
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5
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a triangle with at least two congruent sides
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6
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two geometric figures that have exactly the same size and shape
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7
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a triangle with one obtuse angle
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8
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a pair of sides or angles that have the same relative position in two congruent or similar figures
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9
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when the sides of a triangle are extended, the three original angles of the triangle
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10
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a triangle with no congruent sides
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11
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a triangle with with three acute angles
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12
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when the sides of a triangle are extended, the angles that are adjacent to the interior angles
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