Label the angles with a variable and form an equation that is equal to 180˚. An isosceles triangle has two equal sides. These are shown by the hatch marks. This means that the two base angles ...

Students may notice symmetry in the isosceles and equilateral triangles and non-symmetry in the scalene triangles Informal recognition of these properties may be helpful in recognizing formal ...

Students may notice symmetry in the isosceles and equilateral triangles and non-symmetry in the scalene triangles Informal recognition of these properties may be helpful in recognizing formal ...