Lines, Line Segments, & Rays

Showing where something is; earning credit for getting something right; a dot; a mark on a line plot or other data display.

Rectangular tabletops, floors, or walls; circular clock; triangular pennants.

The top and bottom of a brick; the top of one wall and the bottom of another.

Any closed shape with 4 straight sides, where the sides do not connect at all 90-degree angles is correct.

Students may point out the corners of their desk, or of the floor tiles.

In daily life, lines may be curved or stop, but as a mathematical object lines need to be straight and go on forever.

The sides have a starting point and an ending point. They are line segments.

Sides of rectangular objects; sides of triangles that meet at a 90-degree angle.

For example, a square has 2 pairs of parallel sides and 4 pairs of perpendicular sides.

Yes, as long as they cross somewhere so they share a point, rays or lines could form angles.