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# Triangle Project Code.
# Triangle analyzes the lengths of the sides of a triangle
# (represented by a, b and c) and returns the type of triangle.
#
# It returns:
# :equilateral if all sides are equal
# :isosceles if exactly 2 sides are equal
# :scalene if no sides are equal
#
# The tests for this method can be found in
# about_triangle_project.rb
# and
# about_triangle_project_2.rb
#
def triangle(a, b, c)
raise TriangleError if (a <= 0) || (b <= 0) || (c <= 0)
raise TriangleError if (a + b <= c) || (a + c <= b) || (b + c <= a)
if a == b && b == c
:equilateral
elsif (a == b ) || (a == c ) || (c == b )
:isosceles
else
:scalene;
end
end
# Error class used in part 2. No need to change this code.
class TriangleError < StandardError
end
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