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Polygon
Polygon
A polygon is a closed plane figure with at least three straight sides.
Perimeter
Perimeter
The perimeter of a polygon is the sum of the lengths of the sides of the polygon. Some shapes have special formulas for perimeter, but all derived from the basic definition of perimeter.
Circumference
Circumference
The circumference of a circle is the distance around the circle.
Area
Area
Is the number of square units needed to cover a surface.
Triangle
Triangle
Perimeter
P= b+c+d
Area
A= 1/2bh
Square
Square
Perimeter
P= s+s+s+s= 4s
Area
A=s²
Rectangle
Rectangle
Perimeter
p= l+w+l+w= 2l+2w
Area
A= lw
Circle
Circle
Circumference
C=2πr or C=πd
Area
A= πr²
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