As shown in the figure, two congruent right triangles are overlapped, and one of them is translated to the position of △ def along the direction from point B to C, ab = 10, do = 4, and the translation distance is 6, then the shadow area is () A. 48B. 96C. 84D. 42
According to the properties of translation, be = 6, de = AB = 10, ∧ OE = de-do = 10-4 = 6, ∧ s quadrilateral odfc = s trapezoid abeo = 12 (AB + OE) · be = 12 (10 + 6) × 6 = 48