Contact us
Choose a category below so we can get back to you as quickly as possible.
由題意得,角B=40°根據三角形的正弦定理,可得AB/sinC=BC/sinA=AC/sicB即5/sin90°=BC/sin50°=AC/sin40°sin90°=1所以BC=5sin50°,AC=5sin40°一般高二會學正弦定理,如果還沒學到話,可以用正弦、余弦的定義做.在Rt…
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.