Why is circle 1 similar to circle 2?

circle 1: center (−1, 10) and radius 4.8

circle 2: center (−1, 10) and radius 1.2

a-circle 1 is a dilation of circle 2 with a scale factor of 4.

b-circle 1 and circle 2 have the same center.

c-circle 2 is a dilation of circle 1 with a scale factor of 3.6.

d-circle 1 is congruent to circle 2.

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?