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