obtuseangle,acuteangle

to identify straight, right, obtuse, and acute angles.
angle that is 90 degrees; x=90 vocabulary obtuse angle
77, = 2), obtuse rebound (green, χ 0 = 610.
of their anglesacute triangles have three acute anglesobtuse
钝缘支 obtuse marginal (om) 6.回旋支 circumflex (lcx) 7