Jacob calculated the missing side length of one of these triangle using the Pythagorean theorem. Which triangle is it

Right angle Triangle

Step-by-step explanation:

In this problem Jacob wants to identify the missing side in a triangle.For this Jacob used a strategy named as Pythagorean Theorem.To find the missing angle in a right angled triangle on can use Pythagorean Theorem to identify it.By using the identity, (ADJACENT SIDE)² + (OPPOSITE SIDE)² = (HYPOTENUSE SIDE)² The above identity can be used to identify the missing side in a right angled triangle alone.