Answer:
85 units²
Step-by-step explanation:
By the Pythagorean theorem, in a right triangle, the area of the square adjacent to the largest side is equal to the sum of the areas of the squares adjacent to the other two sides.
So, the area of the square adjacent to the third side of the triangle is equal to:
35 units² + 50 units² = 85 units²
Then, the answer is 85 units²