Question 246890
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If it has 3 equal sides it is equilateral.  That's what equilateral means:  equi- means equal and lateral means sides -- from the Latin.  An equilateral triangle is also equiangular.


If it has 2 equal sides and the third side is different, it is an isosceles triangle.  The Greeks called this equal legged <i>is + skelos</i>.  An isosceles triangle also has two equal angles.


If it has all three sides different, it is scalene.  Greek <i>skalenos</i> meaning uneven.  A scalene triangle has angles of three different measures.


If one of the angles in the triangle is a right angle, that is it measures 90°, then it is a right triangle.  Note, a right triangle can be either isosceles (in the specific case of a 45°-45°-90° triangle) or scalene (in the case of every other right triangle).  A right triangle <i>cannot</i> be equilateral.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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