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When two lines in the same plane are drawn so that they extend into infinity without ever meeting
Isosceles Right Triangle
The sides and angles are always in a particular proportion. The angles are 45º, 45º, 90º and the hypotenuse includes a square root of 2
30-60-90 Right Triangle
Always has the same proportion. The hypotenuse is twice as large and the medium side is equal to the short side times the square root of 3
When are triangles similar?
When their angles have the same degree measures; the sides are proportional
Third Side Rule
States that it is impossible for the third side of a triangle to be longer than the total of the other two sides
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