A compass and straight edge.
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A compass and a straight edge
straightedge (not a ruler, can't have markings) and compass. all of geo only these 2
-- Collect all the information you're given regarding other things, like sides or otherangles, that appear near the missing angle, or are connected to it somehow.-- Gather all the formulas and equations you know that talk about a relationshipbetween an angle and other things. For example, ignore the formulas you have forthe volume and pressure of a gas, but keep the ones that talk about polygons andparallel lines.-- Look through these 'tools' carefully, and find the ones that talk about bothan angle AND the sides or angles or other things that you do know.-- Use the formulas you have to find the relationship between the things thatyou know and the things that you have to find.
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.