関連ワード:  is a right angle less than an obtuse angle    is a right angle open less than an obtuse angle    is a right angle smaller than an obtuse angle    a right angle is less than an acute angle    is a straight angle open less than an obtuse angle    true or false a right angle is less than an acute angle    the magnitude of a right angle is less than that of an obtuse angle true or false    the magnitude of a right angle is less than that of an obtuse angle    an obtuse angle is more than a right angle but less than a straight angle    an obtuse angle is greater than a right angle but less than the  
結果 : is a right angle less than an obtuse angle