Why do I get get "Undefined local variable" in Pythagorean Theorem calculator?

Question

I made a Pythagorean Theorem calculator in Ruby and it has a bug/does not run. The error is:

undefined local variable or method `a2'

I was wondering if anyone could help.

puts "Welcome to my pythagorean theorem calculator. This calculator can find the hypotenuse of any right triangle. Please enter side A of your triangle."
a = gets.to_f
puts "please enter side B of your triangle."
b = gets.to_f
a**2 == a2
b**2 == b2
a2 + b2 = a2_b2
puts "The hypotenuse of your triangle is: #{ Math.sqrt(a2_b2)}"

Answer 1

You just had two small errors:

puts "Welcome to my pythagorean theorem calculator. This calculator can find the hypotenuse of any right triangle. Please enter side A of your triangle."
a = gets.to_f
puts "please enter side B of your triangle."
b = gets.to_f
a2 = a**2
b2 = b**2
a2_b2 = a2 + b2 
puts "The hypotenuse of your triangle is: #{ Math.sqrt(a2_b2)}"

--

Welcome to my pythagorean theorem calculator. This calculator can find the hypotenuse of any right triangle. Please enter side A of your triangle.
3
please enter side B of your triangle.
4
The hypotenuse of your triangle is: 5.0