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What is the formula for reciting mathematics in the first volume of the sixth grade?
The formula for reciting mathematics in the first volume of the sixth grade is as follows:

1. The circumference of a rectangle = (length+width) ×2, and C=(a+b)×2?

Second, the perimeter of the square = side length ×4, C=4a?

Third, the area of the rectangle = length × width, S=ab?

4. area of a square = side length × side length, S=a.a=? a^2

Verb (abbreviation of verb) Area of triangle = base × height ÷2, S=ah÷2?

Six, parallelogram area = bottom x height, S=ah.

Seven, trapezoidal area = (upper bottom+lower bottom) × height ÷2, s = (a+b) H ÷ 2?

Eight, circumference = π× diameter = π× radius× 2, c=πd? =2πr?

Nine, the area of the circle = π× radius× radius? πr ^2