Geographers and sailors created a system of imaginary lines to locate places on the globe. One set of lines runs east and west, parallel with the equator. The other set of lines divide the earth into sections from one pole to the other. If you know which latitude line and which longitude line runs across a given place, you can find that place on a map by looking at the longitude and latitude lines on a map.
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It is the sum of the y-coordinates of the vertices divided by the number of vertices.
Coordinates are linear and/or angular quantities that designate the position of a point in relation to a given reference frame. In a two-dimensional plane, x and y are commonly used to designate coordinates of a point.
equinoctial system of coordinates
If you mean coordinates of (-3, 67) and (2, -14) then it works out as 81.154 rounded to 3 d.p.
If by sperical triangle you mean a triangle on the surface of a sphere, you will need 3 dimensional coordinate geometry. Whether you use polar coordinates or linear coordinates will depend on what you want to "solve".