formula1　　 Calculation of ○5×○5
formula2　　 ○4×○6/○3×○7/○2×○8/○1×○9
formula3　　 "the length of one side except
for rectangular triangle's hypotenuse"
formula4　　 How to identify multiples
formula5　　 arithmetic progression's term
formula6　　 arithmetic progression's sum
formula7　　 the product's end"0" of natural number
formula8　　 the number of aliquot
formula9　　 aliquot's sum
formula10 LCM,GCD
formula11 circulator
formula12 the rationalization of a denominator
formula13 double root sign
formula14 expansion
formula15 "quadratic formula
in case of x's coefficient is even integer"
formula16 the relation between solution and coefficien
formula17 the number of solution is one
formula18 the area of the triangle containing the origin
formula19 the area of triangle
formula20 internally dividing point
formula21 externally dividing point
formula22 barycenter
formula23 incenter
formula24 circumcenter
formula25 shortest distance from a point on the X axis
formula26 shortest distance from a point on the Y axis
formula27 expression of line through one point
formula28 slope of two vertical lines
formula29 two exact halves of square's area
formula30 distance between a point and a line
formula31 rate of change
formula32 line's slope that intersects quadratic function
formula33 parallel straight line crossed quadratic function
formula34 Area of triangle on quadratic function
formula35 "interior angles' sum and exterior angles' sum
of n square shape"
formula36 the sum of star's angles
formula37 Dented square shape's angle
formula38 "angle made in triangle and angle bisector,
inner center"
formula39 regular triangle
formula40 Heron's formula
formula41 Brahmagupta's formula
formula42 the ratio of inscribed quadrangle's area
formula43 Bicentric Quadrilateral's area
formula44 Area's ratio when triangle is plyed
formula45 bisector of triangle's interior angle
formula46 bisector of triangle's exterior angle
formula48 "parallel line１of trapezoid's
upper base and lower base"
formula49 "parallel line2of trapezoid's
upper base and lower base"
formula50 the ratio of trapezoid's area
formula51 the ratio of square's area
formula52 Pythagorean number
formula53 rectangular triangle's confirmation
formula54 the triangle that two angles are 75°and 30°
formula55 the triangle that two angles are 75°and 60°
formula56 the triangle that two angles are 105°and 30°
formula57 right triangle' area of 15°,75°,90°
formula58 Archesta's theorem
formula59 harmonic mean
formula60 diagonal line of regular pentagon
formula61 parallelogram
formula62 Menelaus's theorem
formula63 Ceva's theorem
formula64 Pappus's theorem
formula65 Stuart's theorem
formula67 Ptolemy's theorem
formula68 Power of a point １
formula69 Power of a point 2
formula70 Power of a point 3
formula71 right triangle's inradius
formula72 "an inscribed circle and
the length of tangential line"
formula73 triangle's area circumscribed circle
formula74 "Euler's theorem
(distance between inner center and circumcenter)"
formula75 "the radius of the circle that inscribed
the 60°angle"
formula76 the triangle area inscribed circle
formula77 regular solid
formula78 tetrahedron
formula79 "tetrahedron's inscribed sphere and
circumscribed sphere"
formula80 the radius of inscribed sphere of tetrahedron
formula81 inscribedsphere of quadrangular pyramid
formula82 regular quadrangular pyramid
formula83 regular octahedron
formula84 lateral area and central angle of cone
formula85 sphere
formula86 rectangle truncated pyramid volume1
formula87 rectangle truncated pyramid volume2
formula88 truncated cone's volume
formula89 volume ratio of delta cone
formula90 The volume1 when cutting triangular prism
formula91 The volume2 when cutting triangular prism
formula92 volume cutted quadrangular prism
formula93 delta cone
formula94 "The permutation which places different n
（circular permutation ）"
formula95 The combination which