In a right angled triangle, the hypotenuse is the side opposite the right angle.
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If you mean the hypotenuse of a right angle triangle with sides of 15 cm then use Pythagoras: theorem of:- 152+152 = 450 and the square root of this is length of the hypotenuse which is 15 times the square root of 2 or about 21.213 cm to three decimal places
any triangle is a triangle
acute angled triangle,right angled triangle,obtuse angled triangle,isosceles triangle,equilateral triangle, scalene triangle
equilateral triangle , isosceles triangle , scalene triangle
An equilateral triangle perhaps depending on your meaning of 'ON the triangle'