Answers

2014-06-12T07:48:14+08:00
Area of the trapezoid

A=height  x  Ave. of the parallel sides

A= \frac{a+b}{2} h

see attached pic.
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2014-06-12T09:27:15+08:00
(b1+b2)*h/2

base 1 plus base 2 multiply the height and divide it by 2
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