Question

Which transformation will map an isosceles trapezoid onto itself?
a.rotation by 180degrees about its center
b.reflection across a diagonal
c.reflection across a line joining the midpoints of the nonparallel sides
d.rotation by 360degrees about its center
help please!!!! I have no clue on this one:(

Answer 1

So you know the left and right side of the trapezoid are the same if you draw a line down the center. Just correlate that to a reflection. A general hint is that anything rotated by 360 is back where it started from

Answer 2

still confused:/