由画法几何原理可知平面面积等于其正投影面积乘以该平面与投影面夹角的余弦。
According to principle of descriptive geometry, the area of plane equals projection of the plane divided by cosine between plane and projection of plane.
由画法几何原理可知平面面积等于其正投影面积乘以该平面与投影面夹角的余弦。
According to principle of descriptive geometry, the area of plane equals projection of the plane divided by cosine between plane and projection of plane.
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