Perimeter and Area. Lesson 10-1. Area. Area is the amount of space inside a figure. We use square units to describe area. For rectangles, the area formula is A= lw (area equals length times width).
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A=96 sq. m
Area is expressed in square units. It can be written (in this case) as 96 sq. m or 96 m2.
Count how many squares are completely covered by the shape. Put partial squares together to make wholes.
P = 2w + 2l
P = 2(5) + 2(18)
Perimeter results in regular units, not square units.
P = 10 + 36
P = 46 cm