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There is a slab of concrete in my backyard, and I need to make a half circle cut out in it like this picture below. This is for a 3" pipe to sit in.

How would I go about doing this?

picture

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    With a masonry blade attached to a grinder. Hold grinder at a medium angle to the concrete and make gradual shallow passes. – ojait Sep 15 '15 at 22:19
  • To provide more details for this answer - a diamond blade and a 4 inch angle grinder. It can be used dry. Be sure to wear a mask and goggles. It will make lots of dust. – BrianK Sep 17 '15 at 1:50
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Rather than try to shape the slab so it conforms to the pipe, cut the slab slightly wider and deeper than the pipe. Mix a loose batch of cement, pour into slab cut, and embed pipe into concrete.

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