The Properties of a Trapezoid
Definitions and formulas for the perimeter of a trapezoid, the area of a trapezoid, properties of the sides and angles of a trapezoid, properties of the sides and angles of an isosceles trapezoid
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perimeter of a trapezoid  area of a trapezoid  sides and angles of a trapezoid 
properties of the isosceles trapezoid 
The perimeter of a trapezoid:  
To find the perimeter of a trapezoid, just add up all the lengths of the sides: Perimeter = a + b + c + B 

The area of a trapezoid:  
To find the area of a trapezoid... The longer base (the bottom) is big B and the smaller base (the top) is little b... 

Yeah, that's the formula... But let's check out where it comes from! 
Take two copies of the trapezoid (one blue trapezoid and one green trapezoid)... Tip one upside down and stick them together... Now, you've got a parallelogram. Area of a parallelogram = base x height But, this is double of what we need... So, multiply by 1/2! 