Answer: D. A square with side length of 20 feet.
Step-by-step explanation:
To determine the side length of the square that could be connected to side b of the triangle to correctly complete the model, we would apply Pythagoras theorem which is expressed as
Hypotenuse² = opposite side² + adjacent side²
Hypotenuse = side length of square C
Adjacent side = side length of square A
Let B represent the side length of the required square.
Area of square = (side length)²
Therefore,
841 = 441 + B²
B² = 841 - 441 = 400
B = √400
B = 20 ft
