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Area of Rectangular Figures

b*h

Area of Parallelograms

b*h

Area of Triangles

1/2**b**h

Area of Trapezoids

1/2**(b1+b2)**h

M*H

M*H

Median of Trapezoid

1/2*(b1+b2)

Area of Kites and Rhombuses

1/2**d1**d2

Area of Regular Polygons

1/2**S**A*N

1/2**A**P

1/2

s

side

apothem

distance from the center of a regular polygon perpendicular to side

r

radius

n

number of sides

p

perimeter

Sector

theta(central angle or degree of arc)/360**pi**r2