The sides perpendicular to each other are at right angles (90 degrees, or square) to each other. An example of a figure with two pair of perpendicular sides is the rectangle.
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Two-way slabs are rectangular reinforced-concrete slabs that are supported on all sides. The reinforcement is placed perpendicular to the sides.
It's a case two.. in which a slab has three continuous sides (i.e. three sides are followed by other slabs ).
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A pentagon has five sides. A decagon has ten sides. A heptagon has seven sides. A octagon has 8 sides.
A Class-1 lever is a lever with the force and the load (resistance) on opposite sides of the fulcrum (pivot).