A quadrilateral which has 4 sides
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One more side.
A triangle for example has 3 vertices.
There is no such right triangle. You have defined the relationship between three sides of a triangle that does not have a 90 degree angle. In a right triangle the sum of the squares of the shorter sides equals the square of the longest side and 12 + 22 = 5 ; 42 = 16 it does not equal 5 The angles in a triangle with sides 1, 2, 4 units can be found by applying the cosine rule.
Triangle means 3 angles. No other shape exists and any three angle shape is a triangle
You are a triangle.