the area of an isosceles trapezoid with sides of length 5 and bases of length 9 and 15 is ?
"isosceles trapezoid indicates that if we draw perpendicular from two vertex of the smaller side , the longer side with side 15 will be divided into 3 parts = 9 , 3 and 3 ( making one square and two right triangles ) for the right triangle , height will be = ( 5 ^ 2 - 3 ^ 2 ) ^ 1 / 2 = 4 and the area of trapezoid = 1 / 2 ( b 1 + b 2 ) h = 1 / 2 * 24 * 4 = 48 b"
quadrilateral_area(const_4, 15, 9)