Final answer:
The easiest tool for cutting smooth, regular curves on large projects is a jigsaw, which is designed for intricate cutting on various materials.
Step-by-step explanation:
The easiest way to cut smooth, regular curves on large project parts is to use a jigsaw. This cutting tool is designed specifically for making intricate cuts and can handle a variety of materials, including wood, metal, and plastic. Unlike a hammer, which is used to strike; a drill, which is used to create holes; and a traditional saw, which is better for straight cuts, a jigsaw allows for great flexibility in cutting shapes and curves. By using the correct blade for the material, users can achieve a clean and precise cut.