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Primary school mathematics perimeter area
Square area: axa perimeter: ax4 rectangular area: axb perimeter: (a+b)x2 trapezoidal area: (a+b)xh/2.

Circular area: xRxR Circular perimeter: UxD

Cubic surface area: axax6 Volume: axaxaxa

Rectangular surface area: (axb+bxc+axc)x2 volume axbxh

Cylinder surface area: 2x3. 14xrxr+ xdxh volume: xrxrxh.

Cone volume: 1 3 of Uxrxrxrxhx.

Surface area of sphere = 4 π r 2

The volume formula of the cone is: v= 1/3sh(s is the bottom area of the cone and h is the height of the cone).

The volume formula of prism: V = [S+S'+(SS') (1/2)] h/3.

The truncated cone volume formula: v = [s+s'+√ (ss')] h ÷ 3 = π h (R2+RR+R2)/3.

The formula of frustum surface area is: s = π R2+π r' 2+π rl+π r' l = π (R2+r' 2+rl+r' l).

R- upper bottom radius

R- bottom radius

up level

Prism: base multiplied by height

Ring circumference: outer circumference+inner circumference (πx (major diameter+minor diameter))

Area of circular ring: area of outer circle-area of inner circle (πx long radius square -πx short radius square \πx (long radius square-short radius square))

Expressed in letters:

Internal s+ external s (∏R side)

External s- internal s =∏(R party -r party)

There is a second method:

S=π[(R-r)×(R+r)]

R= radius of great circle

R= radius of small circle