A triangle with side lengths 28ft., 45ft., 53ft. Is a right triangle.

yes a right triangle

Step-by-step explanation:

Using the converse of Pythagoras' identity

If the square of the longest side is equal to the sum of the squares of the other 2 sides then the triangle is right,

53² = 2809 ← square of longest side

28² + 45² = 784 + 2025 = 2809

Thus the triangle is right

Good evening