Use the symmetric property of congruence to complete the statement, if < a = < b, then

Choice D.  < B = < A

ie, "angle B = angle A"

The symmetric property is if y = x then x = y. The order of what is on the left or right side of the equation does not matter. It's like saying 2+3 = 5 is the same as 5 = 2+3.

This idea can be extended to congruences because congruent angles have the same measure.

So < A = < B is the same as < B = < A.

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.

i have not got your picture clearly so see it once again