F600
Tangent functions : R = a + b*tan(p*A/q)^M
F135
Tangent to circle with point outside circle
F136
Tangent to circle with point on circle
F134
Three point define a circle
F149
Triangles in triangles
F114
Triangle : Divide into 4 congruent triangles
F121
Triangle : Heights of triangle are concurrent
F058
Triangle : Names
F112
Triangle : Pedal triangle
F113
Triangle : Ex-central triangle
F115
Triangle : Ortho-center, centoid and circum-center colinear
F126
Triangle : s = (a + b + c)/2
F031
Twin patterns : R = 1 + 1*cos(p*A/4) and R = 1 + 1*sin(p*A/4)
F124
Two parallel lines : Conditions
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