"Aix sponsa. Wood Duck. Summer Duck. "The Bride." Adult Male: Bill pinkish-white, with lake-red base,…
"Fuligula ferina americana. Red-head. American Pochard. The feathers of the head somewhat full and puffy,…
"Fuligula ferina americana. Red-head. American Pochard. The feathers of the head somewhat full and puffy,…
"Fuligula ferina americana. Red-head. American Pochard. The feathers of the head somewhat full and puffy,…
"Buteo vulgaris. hawk of Europe, Upper parts dark brown, very variable in shade according to season…
Tangram pattern with black pieces and thin white-dotted lines. Tangrams, invented by the Chinese, are…
Tangram pattern with black pieces and thin white-dotted lines. Tangrams, invented by the Chinese, are…
Tangram pattern with black pieces and thin white-dotted lines. Tangrams, invented by the Chinese, are…
Tangram pattern with black pieces and thin white-dotted lines. Tangrams, invented by the Chinese, are…
Tangram pattern with black pieces and thin white-dotted lines. Tangrams, invented by the Chinese, are…
Tangram pattern with black pieces and thin white-dotted lines. Tangrams, invented by the Chinese, are…
Tangram pattern with black pieces and thin white-dotted lines. Tangrams, invented by the Chinese, are…
Tangram pattern with black pieces and thin white-dotted lines. Tangrams, invented by the Chinese, are…
A line with arrows on both ends to show that it extends indefinitely. The line is slanting up when read…
A line with arrows on both ends to show that it extends indefinitely. The line is slanting down when…
2 parallel lines with arrows on both ends to show that they extend indefinitely. The lines are slanting…
2 parallel lines with arrows on both ends to show that they extend indefinitely. The lines are slanting…
2 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.
2 parallel horizontal lines with arrows on both ends to show that they extend indefinitely. The top…
2 parallel vertical lines with arrows on both ends to show that they extend indefinitely.
3 parallel lines with arrows on both ends to show that they extend indefinitely. The lines are slanting…
3 parallel lines with arrows on both ends to show that they extend indefinitely. The lines are slanting…
3 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.
3 parallel vertical lines with arrows on both ends to show that they extend indefinitely.
4 parallel lines with arrows on both ends to show that they extend indefinitely. The lines are slanting…
4 parallel lines with arrows on both ends to show that they extend indefinitely. The lines are slanting…
4 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.
4 parallel vertical lines with arrows on both ends to show that they extend indefinitely.
5 parallel lines with arrows on both ends to show that they extend indefinitely. The lines are slanting…
5 parallel lines with arrows on both ends to show that they extend indefinitely. The lines are slanting…
5 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.
5 parallel vertical lines with arrows on both ends to show that they extend indefinitely.
6 parallel lines with arrows on both ends to show that they extend indefinitely. The lines are slanting…
6 parallel lines with arrows on both ends to show that they extend indefinitely. The lines are slanting…
6 parallel horizontal lines with arrows on both ends to show that they extend indefinitely.
6 parallel vertical lines with arrows on both ends to show that they extend indefinitely.
Letter A with a dotted vertical line that is a line of symmetry.
Letter B with a dotted horizontal line that is a line of symmetry.
A line with arrows on both ends to show that it extends indefinitely. The line is slanting up when read…
A line with arrows on both ends to show that it extends indefinitely. The line is slanting down when…
Illustrations of a segment, a ray, and a line that can be used when providing definitions.