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Angle grinders are versatile tools that can grind metal and cut tile, stucco and pavers, rout out mortar, plus they can sand, polish and sharpen. Learn to use an angle grinder to cut tile, mortar and pavers; make quick work of rust and loose paint removal; sharpen blades and cut or grind steel.
Similarly, you may ask, can you use an angle grinder to cut wood?
Cutting wood with an angle grinder carries the risk of injury to the tool operator. Angle grinders typically spin the installed disc at 10,000 - 15,000 RPM. You might safely use it for small cutoffs but there are much better tools for safely cutting wood - circular saws, jig saws, oscillating tools, reciprocating saws.
Keeping this in view, what angle should you use an angle grinder at when grinding a flat surface?
Use the correct angle for the wheel attachment. For grinding, try a 15°-30° angle; make sure you're using the flat part of the wheel when using this attachment. With cutting, use the side of the wheel to cut the piece head-on, meaning you should hold the wheel perpendicular to the piece you're cutting.
Wood cutting saws typically spin in the 3500 to 4000 rpm. If you spun a typical circular saw blade at 10,000 rpm it would come apart. As @Matthew PK has shown they make wheels for working wood with a grinder but they are not the typical toothed blades.