Parallel and perpendicular lines Discover the difference between parallel and perpendicular lines. Measuring angles Find out how to measure angles up to 180 degrees using a protractor. Compare and ...

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 ...

Crows in a lab were able to distinguish shapes that exhibited right angles, parallel lines, and symmetry, suggesting that, ...

Fantastic new math-based buildings popped up around Sara Harp Minter Elementary when students designed Geometry City.