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A little knowledge of mathematics (50 to 250 words).
Definition, Theorem and Formula of Necessary Memory

Area of triangle = base × height ÷2.

formula

S=

a×h \u 2

Area of a square = side length × side length

formula

S=

a×a

Area of rectangle = length × width

formula

S=

a×b

Area of parallelogram = base × height

formula

S=

a×h

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

formula

S=(a+b)h÷2

Sum of internal angles: sum of internal angles of triangle = 180 degrees.

Cuboid volume = length × width × height

Formula: V=abh

Volume of cuboid (or cube) = bottom area × height

Formula: V=abh

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

Formula: V=aaa

Circumference = diameter × π

Formula: L = π d = 2π r

Area of circle = radius × radius× π

Formula: s = π R2

Surface (side) area of cylinder: The surface (side) area of cylinder is equal to the perimeter of bottom multiplied by height. Formula: s = ch = π DH = 2π RH.

Surface area of cylinder: the surface area of 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+2πr2.

Volume of cylinder: the volume of 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