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has one angle greater than 90 degrees
right triangle
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has one 90 degree angle
convex
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curved outward
polygons
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2D closed shapes made up of straight lines
types of triangles
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equilateral, isosceles, scalene
right, obtuse, acute
non-measurable attributes
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refers to a set which cannot be assigned a meaningful "volume".
EX: color, texture, type of material
scalene triangle