The vertices of △ABC are A(2, 1), B(3, 4), and C(1, 3). If △ABC is reflected across the x-axis to create △DEF, what are the coordinates of the vertices of △DEF?

Anew landowner is interested in constructing a fence around the perimeter of her property. her property is 1,080√30 feet wide and 500√20 feet long. what is the perimeter of the property? (recall that the perimeter is the sum of each side of a shape or boundary). a 1,580√40 feet b. 5,320√5 feet c. 3,160√20 feet d. 10,640√5 feet