A compass and a straight edge
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A compass and straight edge.
straightedge (not a ruler, can't have markings) and compass. all of geo only these 2
Construction, engineering, drawing, and architecture all use parallel and perpendicular lines. Other than that, it is an important topic because you are learning how to apply the language and tools of mathematics to an intuitive system. These topics have proven important in the history of human kind and also many before you have shown that by learning about parallel and perpendicular lines, one learns how to use math and logic. It is doubtful that you can make a living off of parallel and perpendicular lines, but if you can't understand parallel and perpendicular lines, then I worry about your future.
You could probably get a lawn aerator(for rent or purchase), whether it is the rolly type, or the ones attached to the bottom of shoes (like cleats). Lawn aeration is usually necessary because of thatch, but you could possibly consider changing the type of grass in your landscaping that has less of a thatch build-up than traditional lawn turf.
Various synthesis tools are provided by vendors like XILINX, CADENCE, SYNOPSIS. Details are available at their websites.