To determine if a triangle is a right triangle using the Pythagorean Theorem, you need to have the lengths of all three sides of the triangle. The theorem states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides. This can be expressed as:
\[ c^2 = a^2 + b^2 \]
where \( c \) is the length of the hypotenuse and \( a \) and \( b \) are the lengths of the other two sides.
If you provide the lengths of the sides of the triangle, I can help you determine if it is a right triangle.