一道sat2数学题the plane whose equation is 6x+5y+10z=30 forms a py

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一道sat2数学题
the plane whose equation is 6x+5y+10z=30 forms a pyramid in the first octant with the coordinate planes.its volume is
A 15 B.21 C 30 D.36 E.45
主要是octant 看不懂

卦限,象限吧
这个坐标平面的方程是6x+5y+10z=30 ,它与其它坐标构成一个棱锥体,求其体积.
坐标图(无法上传图片)是一个在坐标轴正半轴的直棱锥,过点(5,0,0),(0,6,0),(0,0,3)底面直角三角形是15,高是3,因此体积是15

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