If a and b are the sides of a square column and its base, the thickness of the base may be calculated from the formula

• A. <img src="/_files/images/civil-engineering/structural-design-specifications/07-22-114-1.png">
• B. <img src="/_files/images/civil-engineering/structural-design-specifications/07-22-114-2.png">
• C. <img src="/_files/images/civil-engineering/structural-design-specifications/07-22-114-3.png">
• D. <img src="/_files/images/civil-engineering/structural-design-specifications/07-22-114-4.png">