Solving triangle
回答 (3)
2011-03-05 7:31 am
✔ 最佳答案
In ΔABC，b = 2.1cm，A=120degree and SinB：SinC = 1：2. Solve ΔABCSol
SinB：SinC = 1：2
SinB/1=SinC/2
SinB/2.1=SinC/4.2
SinA/a=SinB/b=SinC/c
Sin120度/A=SinB/2.1=SinC/ 4.2
C=4.2
ΔABC=(1/2)BCSinA
=(1/2)*2.1*4.2*Sin120度
=(1/2)*2.1*4.2*√3/2
=441√3/200
2011-03-05 9:05 pm
Solve the ΔABC means that find out all the sides and angles of the triangle. Thx.
2011-03-05 6:12 am
find the angle? find the length of side?
收錄日期: 2021-04-25 17:02:48
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https://hk.answers.yahoo.com/question/index?qid=20110304000051KK00923