SOLUTION: The area of a trapezoid is 465ft what is its top base if the altitude is 28ft and the bottom base is 20ft. please solve it step by step.

Algebra ->  Algebra  -> Customizable Word Problem Solvers  -> Geometry -> SOLUTION: The area of a trapezoid is 465ft what is its top base if the altitude is 28ft and the bottom base is 20ft. please solve it step by step.      Log On

 Ad: Over 600 Algebra Word Problems at edhelper.com Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help! Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

 Word Problems: Geometry Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Geometry Word Problems Question 174346: The area of a trapezoid is 465ft what is its top base if the altitude is 28ft and the bottom base is 20ft. please solve it step by step.Answer by nerdybill(6958)   (Show Source): You can put this solution on YOUR website!If a and b are the lengths of the two parallel bases of a trapezoid, and h is its height, the area of the trapezoid is area = 1/2 × h × (a + b) . plugging in what we know: 465 = 1/2 × 28 × (a + 20) solving for 'a' -- the 'top of the trapezoid' . 465 = 1/2 × 28 × (a + 20) 465 = 14 × (a + 20) 465/14 = (a + 20) 465/14 - 20 = a 33.214 - 20 = a 13.214 feet = a