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8．直径为<em>D</em>的圆形截面，则其对形心轴的惯性矩为（ ）。(单选题)
.<img alt=\"\" height=\"53\" src=\"/api/uploads/1517955/in-rich-contentcreated_at=1647287437\" width=\"46\">.,.
<img alt=\"\" height=\"50\" src=\"/api/uploads/1517954/in-rich-contentcreated_at=1647287437\" width=\"44\">.,.
<img alt=\"\" height=\"54\" src=\"/api/uploads/1517953/in-rich-contentcreated_at=1647287437\" width=\"41\">.,.
<img alt=\"\" height=\"54\" src=\"/api/uploads/1517952/in-rich-contentcreated_at=1647287437\" width=\"50\">

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出自：2024年国家开放大学答案

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