The formula for calculating mathematical figures in primary schools is 1, square c perimeter s area a side length perimeter = side length × 4c = 4a area = side length× side length S=a×a2, cube v: volume a: side length surface area = side length× side length× 6s table =a×a×6 volume = side length× side length v = a.×× Cuboid v: volume s: area a: length b: width h: height (1) volume = length x width x height V=abh5 triangle s area a base h height area = base x height ÷2s=ah÷2 triangle height = area x 2 ÷ base triangle base = area x 2. × h÷28 circular S area c perimeter ∏ d= diameter r= radius (1) perimeter = diameter× 2× radius C=∏d=2∏r(2) area = radius× radius× ∏. Bottom area r: bottom radius c: bottom perimeter (1) lateral area = bottom perimeter x height (2) surface area = lateral area+bottom area x 2 (3) volume = bottom area x height (4) volume = lateral area ÷ 2 x radius 10 cone v: volume h: height. Bottom area r: bottom radius volume = bottom area × height ÷3