Question

How to calculate the area of a pentagon in Ruby

Answer 1

def pentagon_area(side, apothem)
  5.0 * (side * apothem) / 2.0
end

side = 5.0
apothem = 3.0

area = pentagon_area(side, apothem)

puts "Area = #{format('%.2f', area)}"



=begin
run:

Area = 37.50

=end

 

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Answer 2

def area_regular_pentagon(side)
  (1.0 / 4.0) * Math.sqrt(5 * (5 + 2 * Math.sqrt(5))) * (side ** 2)
end

puts area_regular_pentagon(7)


=begin
run:

84.30339262885938

=end

 

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