Calculation formula of mathematical graphics in primary schools
1 square
Area = side length × side length
S=a×a
2 cubic meters
Volume a: edge length
Surface area = side length × side length ×6
S table =a×a×6
3 rectangle
Area a side length
C=2(a+b)
Area = length × width
S=ab
4 cuboid
V: volume s: area a: length b: width h: height.
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
6 parallelogram
S area a bottom h height
Area = bottom × height
S = ah
7 trapezoid
Height of upper bottom b and lower bottom h in s area a
Area = (upper bottom+lower bottom) × height ÷2
s=(a+b)× h÷2
8 laps
Circumference of zone s and zone c
D= diameter r= radius
Area = radius × radius ×∈
Cylinder 9
V: volume h: height s; Bottom area r: bottom radius c: bottom perimeter
(1) lateral area = bottom circumference × height.
(2) Surface area = lateral area+bottom area ×2