Shear centre of a half circular section of radius r and of constant thickness, lies at a distance of x from the centre where x is

• A. <img src="/_files/images/civil-engineering/theory-of-structures/96-21-171-1.png">
• B. <img src="/_files/images/civil-engineering/theory-of-structures/96-21-171-2.png">
• C. <img src="/_files/images/civil-engineering/theory-of-structures/96-21-171-3.png">
• D. <img src="/_files/images/civil-engineering/theory-of-structures/96-21-171-4.png">