right angle / 90 angle :
زاوية مستقيمة \ زاوية 90
In geometry and trigonometry, a right angle is an angle of exactly 90° (degrees), corresponding to a quarter turn. If a ray is placed so that its endpoint is on a line and the adjacent angles are equal, then they are right angles.
obtuse angle :
زاوية منفرجة
noun. an angle greater than 90° but less than 180°.
acute angle :
زاوية حادة
acute angle. An angle whose measure is between 0° and 90°. Compare obtuse angle.
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