How do you find the width of a rectangle when the perimeter is given?

What is the volume of this square pyramid?

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis.how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

Do you mind if you guys me with this question i’m on number 8