The approximate value of torsion constant k for a box of depth d, width b, and having uniform thickness t, is

• A. <img src="/_files/images/civil-engineering/structural-design-specifications/10-22-150-1.png">
• B. <img src="/_files/images/civil-engineering/structural-design-specifications/10-22-150-2.png">
• C. <img src="/_files/images/civil-engineering/structural-design-specifications/10-22-150-3.png">
• D. <img src="/_files/images/civil-engineering/structural-design-specifications/10-22-150-4.png">