What is the area of this trapezium?
ED and BC are perpendicular to DC. ED = a, BC = b, DC = c
(1/2)(c+b)(b+a)
(1/2)c(a+b)
(1/2)a(c+b)
(1/2)b(c+a)
area of a trapezium FEDB = 12[(distance between parallel sides)(sum of the parallel sides)] = 12c(a + b)
1−2ab−(a2+b2)=?(a) (1+a−b)(1+a+b)(b) (1+a+b)(1−a+b)(c) (1+a+b)(1−a−b)(d) (1+a−b)(1−a+b)