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2182                                                                 ARITHMETIC

VOLUME.

1728 cubic inches (cu. in.) =1 cubic foot (cu. ft.)

27 cubic feet = l cubic yard (cu. yd.) 128 cubic feet=l cord (cd.) 16 cubic feet=l cord foot (cd. ft.)

8 cord feet=l cord (cd.) A cord of wood is a pile of wood 8 ft. long, 4 ft. wide, and 4 ft. high.

A CORD OF WOOD                                                * CORD FOOT

8 FEET LONG

A rectangular solid is a solid bounded by six rectangles. The rectangles are called the faces of the solid.

A cube is a rectangular solid bounded by six equal faces (squares). The volume of a solid is its contents reckoned in cubic units.

How many cubic feet are there in a rectangular solid 4 ft. long, 2 ft. wide and 4 ft. high?

Multiply the number of cu. ft. in 1 row by the number of rows, to find the number of cubic feet in 1 layer.

Multiply the number of cu. ft. in 1 layer by the number of layers. This gives the number of cu. ft. in the solid.

4 cu. ft. in 1 row. 2

8 cu. ft.

4 (number of layers).

8 cu. ft. in the 2 rows (the bot-          —

torn layer).                              32 cu. ft. in the solid.

Eule for volume.

To find the volume of a rectangular solid, multiply the area of the base by the height.