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Area of Base Formulas

Formulas for finding the Area of Base of Geometric Shapes

base area
 Triangle
1⁄2 b*h
b=base
h=height
b=base     h =height
 Rectangle
length * width

 Trapezoid 1⁄2 h ( b_1+ b_2 )
h = height
b_1=base 1
b_2=base 2
 Square s^2 s =side
 Parallelogram base * altitude
Pentagon 1⁄2  a*p  
a = apothem
P = perimeter
Hexagon
1⁄2  a*p  
a = apothem
P = perimeter
 Heptagon
1⁄2  a*p  
a = apothem
P = perimeter
Octagon

1⁄2  a*p  
a = apothem
P = perimeter

The base of a shape like a polygon is the bottom of the shape. In order to find the area of the base the formula one uses depends on the shape of the object. Here is a list of the most common base area formulas.