Formulas for perimeter and area of all shapes

1, perimeter and area formula of rectangle and square:

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

Circumference of a square = side length ×4 C=4a

Area of rectangle = length × width S=ab?

Area of a square = side length × side length s = a a = a?

2, triangle, parallelogram, trapezoid area formula:

Area of triangle = base × height ÷2 S=ah÷2?

Area of parallelogram = base × height S=ah?

Trapezoidal area = (upper bottom+lower bottom) × height ÷2?

S=(a+b)h÷2？

3, the circumference and area of the circle formula:

Circumference = diameter × π?

Formula: L = π d = 2π r

Area of circle = radius × radius× π?

Formula: s = π r?

4. lateral area and surface area formula of cylinder:

Transverse area of cylinder:

The side area of a cylinder is equal to the perimeter of the bottom multiplied by the height.

Formula: s = ch = π DH = 2π RH.

Surface area of cylinder:

The surface area of a cylinder is equal to the perimeter of the bottom multiplied by the height plus the area of the circles at both ends.

Formula: S=ch+2s=ch+2πr?

Extended data

1, volume formula of cylindrical cone:

Cylinder volume:

The volume of a cylinder is equal to the bottom area multiplied by the height.

Formula: V=Sh?

Volume of cone = 1/3 bottom× product height.

Formula: V= 1/3Sh?

2. Fraction addition and subtraction:

Add and subtract fractions with the same denominator, only add and subtract numerators, and the denominator remains the same.

Fractions of different denominators are added and subtracted, first divided, then added and subtracted.

3. Multiplication of fractions:

Use the product of molecules as numerator and the product of denominator as denominator.

4. Rules for dividing scores:

Dividing by a number is equal to multiplying the reciprocal of this number.