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Children's Dictionary
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]