Answer: 3,086.96 ft²
Explanation:
First, we will find the area of her square backyard.
A = L²
A = (60 ft)²
A = 3,600 ft²
Next, we will find the area of this fountain.
The diameter (6 feet) divided by 2 is equal to the radius.
A = πr²
A = (3.14)(6 ft)²
A = 113.04 ft²
Lastly, we will subtract the fountain area and the flowerbed area from the grass backyard area. You have already found the flowerbed area correctly, (10 ft * 10 ft) * 4 = 400 ft²
3,600 ft² - 400 ft² - 113.04 ft² = 3,086.96 ft²