Hey there I am here to tell you about cordinate grids. Grids help you locate things such as on a map they use grids to locate things such as mountains. There are two axis's they are the x and y axis first comes x then y. We use a program called geo logo on geo logo we made polygons. We had to use crdinates to make polygons such as a square, triangle and rectangle. A grid has 4 sections there are nagitive numbers and normal numbers. Well I hope this helped you with grids! Next polygons are shapes such as squares, triangles, rectangle there is even one called a dodeckahedron. polygons are complicated they have things call vertices, and angles. Also triangles have 3 points and each point has an angle each triangle has 180 degrees total. If the triangle doesn't well... it isn't a triangle. And thats all I know about coordinate grids polygons and triangles.

-Torres9