The calculation formula of mathematical figures in primary schools is 1 square c perimeter s area a side length perimeter C= side length × 4 = 4a area = side length× side length S=a×a 2 cube surface area = side length× side length× 6. S table =a×a×6 3 rectangle C circumference S area A side length circumference = (length+width )× 2 = 2 (a+b) area = length× width S=ab 4 cuboid S: area A: length B: width H: high surface area = (length× width+length× height+width× height) × 2, S=2(ab+ah+bh) 5 triangle S area A bottom H height area = bottom× height ÷2 s=ah÷2 triangle height = area× 2 bottom triangle bottom = area× 2 high parallelogram S = (A+B )× H ÷ 28 circle S area C circumference ∏ d= Bottom area r: bottom radius c: bottom perimeter (1) lateral area = bottom perimeter × height (2) surface area = lateral area+bottom area ×2.

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