Did you know that one half turn is 180°? If the straight line or half turn is divided into two angles, and we know one of the angles, we can work out the other. Here 120° + 60° = 180° If we ...
When two lines intersect, the opposite (X) angles are equal. On parallel lines, alternate (Z) angles are equal. On parallel lines, corresponding (F) angles are equal. On parallel lines ...
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