Answer:
rectangles, square, and isosceles trapezoids
Step-by-step explanation:
It's asking which shapes always have the property that two pairs of two angles next to each other are congruent.
This would be true for rectangles, square, and isosceles trapezoids.
AC = 28 feet
Point C is the midpoint of AB, so AC is half the length of AB:
AB/2 = (56 ft)/2 = 28 ft = AC