157
Unit 17 Four-Sided Measure
Copyright by The Goodheart-Willcox Co., Inc.
Area of a Rectangle
To calculate the area of a rectangle, multiply length by width.
A = 21.3″
×
9.5″
A = 202.35 in2
Parallelogram
A parallelogram is a shape having four sides, its opposite sides being the same length and
are parallel. The angles opposite each other are equal. It looks like a rectangle that has been
tilted.
Parallel sides
Length
Parallel
sides
Height
Equal angles
Width
Perimeter of a Parallelogram
To calculate the perimeter of a parallelogram, add the four sides.
P = 193 mm + 193 mm + 64 mm + 64 mm
P = 514 mm
Area of a Parallelogram
To calculate the area of a parallelogram, multiply the length by the height.
A = 51′
×
26′
A = 1,326 ft2