Shar needs total of 48 Feet of fencing for the entire animal pen.
Pythagoras Theorem gives us a relation between the sides of right triangle . According to the Pythagoras , Square of hypotenuse if equal to sum of square of other two sides.
Right triangle has three side where longest side is given 20 feet and shortest side is 16
Using Pythagoras Theorem ,
(20)² = (16)² + (third side)²
(third side)² = 400 - 256
(third side)² = 144
taking square root
third side = 12 feet
Total feet required = 20 + 16 + 12
= 48 feet
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