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| crank |
a device that moves things in a circle. Cranks have a lever attached at a right angle to the end of an arm that moves in a circle. Cranks are turned by hand or by another arm that connects to the lever. [1/4 definitions] |
| foursquare |
having four equal sides that meet in four right angles; square. [1/4 definitions] |
| hypotenuse |
the side opposite the right angle in a right triangle; the longest side of a right triangle. |
| oblique angle |
an angle that is not a right angle. |
| paddle wheel |
a wheel that has boards or paddles fixed at right angles around it. A paddle wheel is used to move a river steamboat. |
| perpendicular |
at a right angle to. [1/2 definitions] |
| plaid |
a cloth with a pattern of stripes of different widths and colors, crossing at right angles. [1/3 definitions] |
| rectangle |
a flat, closed figure with four straight sides, four right angles, and opposite sides parallel to each other. |
| right triangle |
a triangle with a right angle. |
| scythe |
a tool that has a long handle with a long, curved blade attached to the end at a right angle. It is used for cutting grass or harvesting grain by hand. |
| square |
an instrument with straight edges and a right angle used to draw or test right angles. [4/22 definitions] |
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