Posted by Sarah on Monday, January 7, 2008 at 9:17pm.
Area of a trapezoid
solve for b1: A= 1/2h(b1= b2)

Math  Damon, Monday, January 7, 2008 at 9:29pm
Looks like a typo
A = (1/2) h (B1+B2)
2 A = h B1 + h B2
h B1 = 2 A  h B2
B1 = (2 A  h B2) / h