Final answer:
The three basic forms of balance are symmetry, asymmetry, and radial balance. Symmetry involves mirroring on two sides, asymmetry uses different elements to create visual weight, and radial balance radiates from the center.
Step-by-step explanation:
The three basic forms of balance in the context of visual arts are symmetry, asymmetry, and radial balance. Symmetry, such as bilateral symmetry, refers to an even distribution where two sides mirror each other. This creates a sense of harmony and formality, as observed in Perugino's painting, Christ Giving the Keys of the Kingdom to St. Peter.
Asymmetry, on the other hand, achieves balance without exact mirroring but by arranging elements so that they have a similar visual weight. An example would be the Classical Greek sculpture Doryphoros (The Spearbearer) by Polykleitos.
Finally, radial balance originates from the center and moves towards the edges, as depicted in Buddhist mandala paintings. Elements are often symmetrical around the center, despite the overall image not being a mirror image across the center.