Toby made a heart-shaped cake for his mom's birthday. He baked a square cake and a round cake. One side of the square cake is 9 inches long, and the diameter of the round cake is 9 inches. Both cakes have a height of 3 inches. He cut the round cake in half and attached it to two sides of the square cake to form the heart. He covered the combined cake in red frosting before adding decorations.

What is the approximate area that Toby covered in red frosting?