The side of a triangle that is opposite to 90 degree angle is called hypotenuse. The side that is opposite to the given angle (The angle that is under calculations) is called opposite.
The side that is adjacent with the given angle is called base.
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Parallel sides do not intersect. Perpendicular sides intersect at a right angle.
sides
Not always because the largest angle of a right angle triangle is between its smallest sides which measures 90 degrees
An equilateral triangle has all sides the same length and all its angles are 60dgrees. A right angled triangle is just a triangle with a right angle.
The longest side is always opposite the right angle so the sides of the right angle are 3 and 4 units.