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o Obtuse-Angled Triangle: An obtuse triangle (or obtuse-angled triangle) is
a triangle with one obtuse angle (greater than 90°) and two acute angles.
Note: In an obtuse triangle, one of the angles is obtuse and each one of
the remaining two angles is an acute angle.( Because the sum of the all
the angles of a triangle is 180º.)
o Right-Angled Triangle: A right triangle or right-angled triangle is
a triangle in which one angle is a right angle (that is, a 90-degree angle). ...
The side opposite the right angle is called the hypotenuse (side c in the figure).
