equilateral triangle - 3 equal sides and 3 equal angles, isosceles triangle - 2 equal sides, scalene triangle - 0 equal sides, right triangle - has 1 90° angle or right angle, acute triangle - has 3 acute angles, obtuse triangle - has 1 obtuse angle, adjacent sides - side by side - adjoining, angle - for med when the number of degrees inside two segments have a common enpoint,

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