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obtuseangle,acuteangle

(4 questions about liee.
(4 questions about liee.obtuse angle acute angle right angle straight line i mean the
obtuse angle acute angle right angle straight line i mean theobtuse angled triangle
obtuse angled triangleobtuse angle
obtuse angleadjacentangle 邻角  角度 degree acute angle锐角 obtuse angle钝角
adjacentangle 邻角 角度 degree acute angle锐角 obtuse angle钝角
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