单词complementary angle
un.: 〔数〕补角;余角网络: 互为余角;两个角互为余角;互余
余角:
either of two angles which together make 90˚
余角
〔数〕补角
The long frame bar and the short frame bar adopt the mutual complementary angle slope butt-joint.
所述的长框架条与短框架条采用互为余角的斜面对接。