Y = an (x-h) square +k vertices.

Y=a(x+b/2a) square +(4ac-b square) /4a general variable vertex type.

The internal sum of n polygons is equal to (n-2)* 180.

The outer angle of a triangle is equal to the sum of two non-adjacent inner angles.

The square of the height of the hypotenuse = the product of two segments of the truncated hypotenuse (mapping theorem)

The midline theorem of triangle and trapezoid (the midpoint line between two sides is equal to and parallel to 1/2 of the third side) (the midpoint line between two waists is equal to and parallel to 1/2 (upper bottom+lower bottom))

In the same circle, an equal chord is an equal arc and an equal arc is an equal angle.

Physics: density = mass/volume

Speed = distance/time

Gravity = mass/gram

F 1L 1=F2L2 (lever parallel state)

Tension = Re-erection/number of ropes

Pressure = pressure/stressed area (solid)

Pressure = density *g* depth

Electric power = voltage * current

Resistance = voltage/current

Resistance exothermic = square of current * resistance value * time

Buoyancy = gravity of boiling water

Buoyancy = gravity-tension of object (measurement method)

Buoyancy = gravity of an object (floating, suspending)

Heat released (absorbed) = specific heat capacity * mass * rising (falling) temperature

Electric power = electric power work/time

Work = pull * pull moving distance (total work) = gravity * gravity moving distance (useful work)

Mechanical efficiency = useful work/total work

Chemistry: Extranuclear electron number = proton number = nuclear charge number.

Please remember the equation of chemical reaction, the color of chemical substances and the dissolution of each substance!