### Home > CC4 > Chapter 5 > Lesson 5.1.1 > Problem 5-16

5-16.

On graph paper, plot

*ABCD*if*A*(–1, 2),*B*(0, 5),*C*(2, 5), and*D*(6, 2). 5-16 HW eTool (Desmos). Homework Help ✎If

*ABCD*is rotated 90° counterclockwise (↺) about the origin, name the coordinates of the image*A*′*B*′*C*′*D*′.On your graph, reflect

*ABCD*across the*y*-axis to find*A*″*B*″*C*″*D*″. Name the coordinates of*A*″ and*C*″.Calculate the area of

*ABCD*. Hint: Divide the figure into rectangles and triangles.

Complete the tables in the eTool below to plot the points, rotate and reflect the shape.

Click on the link at the right to view full version of the eTool: Int1 5-16 HW eTool.