I. ALL TRIANGLES HAVE INTERIOR ANGLES THAT ADD UP TO 180 degrees
II. Naming Triangles by their ANGLES
A. A. Acute triangle: a triangle with all angles less than 90 degrees
B. B. Obtuse triangle: a triangle with one angle greater than 90 degrees
C. C. Right triangle: a triangle with one right angle
III. Naming Triangles by their sides
A. Equilateral triangle: a triangle with three congruent sides
B. Isosceles triangle: a triangle with exactly two congruent sides
C. Scalene triangle: a triangle with no congruent sides
Check out this helpful link from math.com for pictures and more explanation about each of these types of triangles
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