C△= the sum of the lengths of three sides

C rectangle

= (length+width)

×2

Parallelogram = 2 times the sum of the lengths of two adjacent sides.

C squared = side length ×4

C diamond = side length ×4

C circle =2πr(r is the radius) =.

πd(d is the diameter)

C trapezoid = two bottom lengths+two waist lengths

(2) area

S△= bottom × height ÷2

S rectangle = length × width

S parallelogram = base × height

S square = the square of the side length

S diamond = half of diagonal product

S circle =πr2(r is the radius)

S trapezoid = (upper bottom+lower bottom)

× Gao ÷2

The calculation formula of cylinder is as follows:

Lateral area formula of cylinder: lateral area = perimeter of bottom × height.

S side = c bottom ×h

The formula of surface area of cylinder is: surface area =2πr2+ bottom circumference × height.

S table = S bottom +C bottom × h.

Volume formula of cylinder: volume = bottom area × height.

V cylinder = s bottom ×h

Volume formula of cuboid:

Cuboid volume = length × width × height

If a, b and h are used to represent the length, width and height of a cuboid respectively, the formula is: v length =abh.

Surface area formula of cube:

Surface area = side length × side length ×6

S positive = a 2× 6

Volume formula of cube:

Volume of cube = side length × side length × side length.

If a is used to represent the side length of a cube, the volume formula of the cube is V positive = A A A = A 3.

The volume of the cone = 1/3× bottom area× height.

V-cone = 1/3× s bottom× h