Draw faint lines separating the different sections. Label them A, B, and C for your convenience.
The length of the space is 12 feet (3. 7 m), and the width is 15 feet (4. 6 m).
Ex: 12 feet (3. 7 m). x 15 feet (4. 6 m). = 180 square feet
Ex: 20 feet (6. 1 m). x 10 feet (3. 0 m). = 200 square feet.
Ex: 20 feet (6. 1 m). x 35 feet (10. 7 m). = 700 square feet
Square footage of Space A + square footage of Space B + square footage of Space C = square footage of the entire space 180 + 200 + 700 = 1080 square feet
Ceiling and floor tiles are often one square foot in size. You can simply count these to get a close approximation of the total square footage.
Next, divide that number by 2 to get the radius (r) and plug the result into the equation A = πr2. Finally, divide by 2 to get the area, or square footage, of the half circle.
