1. Perimeter of rectangle = (length+width) ×2
Formula: C=(a+b)×2
2. The circumference of a square = side length ×4
Formula: C=4a
3. Area of rectangle = length × width
Formula: S=ab
4. Square area = side length × side length
Formula: S=a*a
5. Area of triangle = base × height ÷2
Formula: S=ah÷2
6. Area of parallelogram = base × height
Formula: S=ah
7. Trapezoidal area = (upper bottom+lower bottom) × height ÷2
Formula: s = (a+b) h ÷ 2
8. Diameter of circle = radius ×2
Formula: d=2r
9. Radius of a circle = diameter ÷2
Formula: r= d÷2
10. The circumference of a circle = π× diameter = π× radius× 2.
Formula: c=πd =2πr
1 1. Area of circle = π× radius× radius.
Formula: S=πr?
12. cuboid volume = length× width× height
Formula: V=abh
13. cuboid (or cube) volume = bottom area × height
Formula: V=S bottom area h
14. Volume of cube = side length × side length × side length
Formula: V=a?
15. The side area of the cylinder = the circumference of the bottom × the height.
Formula: S=C bottom h = π DH = 2π RH.
16. Surface area of cylinder = perimeter of bottom × height+area of circles on both sides.
Formula: S=Ch+2S=Ch+2πr?
17. Volume of cylinder = bottom area × height
Formula: V=Sh
18. The volume of the cone =? Bottom area × height
Formula: V=? hush
Complete set of commonly used formulas in primary school mathematics (unit conversion table)
1. Length unit conversion
1 km =1km1km =1000m1m =10 decimeter1decimeter =10cm/kloc-.
2. Area unit conversion
1 m2 = 100 square decimeter 1 square decimeter = 100 square centimeter
1 cm2 = 100 mm2
3. Volume (volume) unit conversion
1 m3 = 1000 cubic decimeter
1 cubic centimeter = 1000 cubic millimeter 1 liter = 1 cubic decimeter = 1000 ml.
1 ml = 1 cm3
4. Conversion of weight units
1t = 1000kg 1kg = 1000mg = 1kg。
5. RMB unit conversion
1 yuan = 10 angle 1 angle = 10 point 1 yuan = 100 point.
6. Time unit conversion
1 century = 100 1 year =65438+ February.
The big month (3 1 day) includes:1\ 3 \ 5 \ 7 \ 8 \10 \ 65438+February.
Abortion (30 days) includes: April \ June \ September \165438+1October.
February 28th in a normal year and February 29th in a leap year.
There are 365 days in a normal year and 366 days in a leap year.
1 day =24 hours 1 hour =60 minutes.
1 minute =60 seconds 1 hour =3600 seconds.