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Equilateral Triangle or Equiangular Triangle
A triangle having all three sides of equal length. The angles of an equilateral triangle all measure 60 degrees
Isosceles Triangle
A triangle having two sides of equal length.
Scalene Triangle
A triangle having three sides of different lengths
Acute Triangle
A triangle having three acute angles
Obtuse Triangle
A triangle having an obtuse angle. One of the angles of the triangle measures more than 90 degrees.
And one more as a BONUS!
Right Triangle
A triangle having a right angle. One of the angles of the triangle measures 90 degrees. The side opposite the right angle is called the hypotenuse. The two sides that form the right angle are called the legs. A right triangle has the special property that the sum of the squares of the lengths of the legs equals the square of the length of the hypotenuse. This is known as the Pythagorean Theorem.
2). quadrilateral an n-gon and the reason for n-gon is that n could be equal to 3
3). Quadrilateral
A four-sided polygon. The sum of the angles of a quadrilateral is 360 degrees, n-gon is the only correct one where n = 4
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