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------------------------------------------------ Many tools have sharp edges that are also known as which of the following?

A. Saws
B. Blades
C. Cutters
D. Edgers

The term for sharp edges on tools like knives or swords is 'blades.' These blades, when sharpened, have a smaller surface area that allows them to cut through materials more effectively, with examples seen in Acheulean tools like stone blades and hand-axes.

Explanation:

Many tools bearing sharp edges that are designed for cutting, thrusting, or chipping are known as blades. This term applies to a variety of instruments, from kitchen knives to the sword. The cutting edge of such tools, when sharpened, have a smaller surface area, enabling them to exert a higher pressure with the same amount of force, making them cut through material more effectively. This principle can be seen in Acheulean tools, which include hand-axes made by careful chipping of stones or stone blades attached to handles.

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