A. Reflective symmentry over the line y=-x
The trapezoid, also known as a trapezium, of a 4-sided shape with 2 parallel bases that are different lengths. The formula of the area of a trapezoid is A = ½(b 1 +b 2)h, where b 1 or b 2 are the lengths of the bases or h is the height. If you only know the side lengths to a regular trapezoid, you can break the trapezoid into the simple shapes to find the height or finish the calculation.
Line y=-x, slope -1 is perpendicular bisector to base running from (-8,1) of (-1,8), slope 1, or figure is isosceles trapezoid so even though the figure is cut off we know line is also perpendicular bisector to the other base.
Although (-8,1) rotates of (-1,8) about (-1,-1) through 90°, the other vertices do not. Always check more than one vertex.
If you draw some segments perpendicular to y=-7x+1, you see that the points on left don't map to points on right.
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