Determine whether a Triangle with side lengths of 11, 20 and 20 is a Right Triangle

Given Side Lengths: 20, 11, 20
A Right Triangle must satisfy the Converse of the Pythagorean Theorem: a² + b² = c²
From the given side lengths, let a = 11, b = 20, c = 20  (c cannot be less than a or b)
a² + b² = (11)² + (20)²
a² + b² = 121 + 400 = 521
c² = (20)² = 400
a² + b² ≠ c²  (521 ≠ 400)
Therefore, a Triangle with side lengths of 11, 20 and 20 is NOT a Right Triangle
Note: Since a² + b² > c²  (521 > 400), the Triangle is an Acute Triangle