The distance of the centroid of a semi-circle of radius r from its base is

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/90-555-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/90-555-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/90-555-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/90-555-4.png">