the area of an isosceles trapezoid with sides of length 5 and bases of length 7 and 13 is ?
isosceles trapezoid indicates that if we draw perpendicular from two vertex of the smaller side , the longer side with side 13 will be divided into 3 parts = 7 , 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 * 20 * 4 = 40 a
quadrilateral_area(const_4, 13, 7)