Are all orchestras arranged on stage the same way?

For the most part. The string sections (violins, violas, cellos) are found immediately in front of the conductor and are arranged in a semi-circle. The string basses stand behind the cello section. The winds (oboes, flutes, piccolo, clarinets, and bassoons) are seated in two horizontal lines directly behind the strings. The brass (French horns, trumpets, trombones, and tuba) are seated in the back of the orchestra along with the timpani, percussion, piano, and harp.