The area of the patio (A) is half of the area of the circle (A1) with a diameter of 21 ft: A = A1/2
The area of the circle with radius r is: A1 = π * r² π = 3.14 We do not have the radius, but we know that it is a half of the diameter: r = 21 ft / 2 = 10.5 ft
A1 = 3.14 * (10.5)² = 346.18 ft²
So, the area of the patio is: A = A1/2 A = 346.18 ft² / 2 A = 173.09 ft² ≈ 173 ft²
