A right angle triangle has an hypotenuse which is its longest side, an adjacent side and an opposite side.
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There can be no tangent side. The tangent of an angle, in a right angled triangle, is a ratio of the lengths of two sides.
an equilateral triangle has 3 congruent sides and angle measures.
Pythagoras' theorem states that for any right angle triangle its hypotenuse when squared is equal to the sum of its squared sides.
In a right angled triangle its hypotenuse when squared is equal to the sum of its squared sides which is Pythagoras' theorem for a right angle triangle.
For a right angle triangle the trigonometrical ration is: tangent = opposite/adjacent