Contact us
Choose a category below so we can get back to you as quickly as possible.
圖1中,角1和角2是DC和AB兩條直線被DB所截形成的,他們都是銳角; 圖1中,角3和角4是AD和BC兩條直線被DB所截形成的,他們都是銳角; 圖2中,角1和角2是DC和AB兩條直線被CB所截形成的,角1是銳角,角2是鈍角; 圖2中,角3和角4是AD和BC兩條直線被AE所截形成的,他們都是銳角.
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.