# It's Geometry! 2

**Calculus**Level 4

If the lengths of three sides of a trapezium other than base are equal to 10 cm,then find the area of trapezium when it is *maximum*.

**Details**:-Let the area be represented as \(\frac{a\sqrt{3}}{b}\) where \(a\) and \(b\) are coprime positive integers. Find \(a+b.\)