This paper applies geometric vector concept to derive the relations between double plane angle ( angle between two planes ) and planar angle when three planes intersects each other , and obtains eight formulae for working out the related angles and expanded dimensions on driver ' s cabs of material handling equipment 摘要?jiǎng)佑脦缀沃邢蛄康母拍睿茖?dǎo)出3個(gè)平面兩兩相交時(shí),其二面角與平面角的關(guān)系,得出8個(gè)計(jì)算公式,可解決起重運(yùn)輸機(jī)械駕駛室的有關(guān)角度和展開尺寸的計(jì)算。