Given in the△ABC,a,b,c are three sides of the triangle,and
=
+
,then∠A is( )
(英汉词典acute angle:锐角;obtuse angle:钝角)
| 3 |
| a |
| 2 |
| b |
| 1 |
| c |
(英汉词典acute angle:锐角;obtuse angle:钝角)
| A、acute angle |
| B、right angle |
| C、obtues angle |
| D、acute angle or obtues angle |