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what is circular saw is it different from ordinary saw?

Circular saw:

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That’s the one

A circular saw is a type of electric saw. It’s very versatile and can get many work done. But it’s very powerful and needs to be used with care.

One less powerful saw, if you prefer something a bit more gentle, is a jigsaw but it’s harder to cut straight with it.

You can of course buy hand powered tools but you will spend much less time with power tools.