用正弦定理
AC/sin30度=2R
R为半径,R=2
三角形ABC内接于圆O,角B=30度,AC=2,则圆O半径长为?
三角形ABC内接于圆O,角B=30度,AC=2,则圆O半径长为?
数学人气:730 ℃时间:2020-02-06 03:28:56
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