Geometry Calculators Home » Geometry » Geometry Calculator Geometry related calculators at fineducalcs. Various geometry calculators are listed here. Useful for students in solving mathematics problems, learn how to solve and to verify their own calculated output. Irregular Quadrilateral Area Calculator Input the four sides and any of angle or diagonal to calculate area of irregular quadrilateral geometry object. Circle Calculator Calculate Area and Perimeter of Circle and Sector. Also find the chord length in the any circle given radius and angle at center or sagitta length. n-Polygon Area Calculator Find how to calculate sum of all internal angles of any polygon. Calculate area of regular polygon here with input of side length and no. of sides. Centroid Calculator Calculate centroid of a triangle, by giving all three vertices coordinates. The centroid point is shown after submitting the input.