Law of sines or cosines
SinA/a=SinB/b=SinC/c
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If the length of only one side is known, it is not possible to determine whether or not the triangle is right angled.
True
A triangle only has one altitude which is its perpendicular height.
A triangle can have only one right angle (90o). Such a triangle is called a right triangle.
A right angle triangle has a right angle and two acute angles that all add up to 180 degrees.