Angles in a triangle add up to [180 degrees]. Angles in a quadrilateral add up to [360 degrees]. Angles on a straight line add up to [180] degrees. In an [isosceles] triangle, two angles are equal. If two lengths are marked with short lines, those two sides are [equal]. Vertically opposite angles are [equal.]. Angles around a point add up to [360] degrees..

Angle facts

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