When a pair of parallel lines meet an intersecting transversal, pairs of angles with particular properties are made. Corresponding angles are equal. The lines make an F shape. Notice that the F ...

Scientists tested crows on their ability to recognize “geometric regularity,” a skill previously assumed to be unique to ...

Parallel lines are indicated by arrows going in the same direction. If there is more than one set of parallel lines in a diagram, different numbers of arrows are used. The three lines in this ...

Crows can recognize geometric patterns, suggesting that humans aren't unique in understanding shape structure.