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2. AREA Area (mathematics), in mathematics, the size of an
enclosed region, given in terms of the square of a designated
unit of length. Formulas for the areas of simple geometric
figures include a2 for a square, where a is a side; ab for a
rectangle, where a and b are two adjacent sides; and pr2 for a
circle, where r is the radius .

4. Perimeter, or boundary,
the line drawn around the
edge of an area or shape.
For example, the
perimeter of a rectangle is
the sum of its four sides;
the perimeter of a circle is
known as its
circumference.
Perimeter

6. The process of blade toolmaking, developed
about 40,000 years ago, involved several
steps of production. (1) Using a palm-sized
hammerstone, the toolmaker created a flat
platform by knocking off the top of a larger
stone. (2) Using a wooden hammer and a
piece of antler or bone, the toolmaker struck
down on the edge of the platform, knocking
off several long bladelike pieces around the
perimeter. (3) Againusing a piece of antler
or bone, the toolmaker retouched the blade
flake by removing smaller flakes to create a
finished tool. Some examples of different
types of blade tools appear to the right.