F115
Centoid, circum-center and orthod-center of triangle colinear
F116
Cos(A - B) = cos(A)*cos(B) + sin(A)*sin(B)
F130
Centroid
F301
Centroid
F130
Centroid of triangle
- 1. 2/3 rule
- 2. Locus of gravity center-center
F138
Chord : number of chords of 5 points on circle
F125
Circle : Angles in circle
F137
Circle : Concyclic
F135
Circle : Draw tangent to a circle
F136
Circle : Draw tangent to a circle
F134
Circle : Three points define a circle
- 1. Circum- circle method
- 2. x^2 + y^2 + a*x + b*y + c = 0
F127
Circum-center of triangle
- Draw circle passing three given points
- Sine Law
F103
Circle and common tangent
- 1. Three circles tangent each other with comman tangent
F136
Circle and tangent
- 1. Tangent TP perpendicular to radius PC
- 2. Tangent TP = tangnet TQ
F103
Circle : Three circles touch each other with common tangent
F053
Circular functions : Three circles touch each other with common tangent
F115
Circum-center, centoid and orthod-center of triangle are colinear
F137
Concyclic
- P, Q, R, S, are concyclic if angle QPS = angle QRS
- P, Q, R, S, are concyclic then angle RPS = angle RQS
F213
Cubic functions with 3 zeros : Find expression
- 1. Method 1 : y = (x - r)*(x - s)*(x - t)
- 2. Method 2 : Equation thoery
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