What is pedal triangle In acute angle triangle (orthocenter of ABC is Incenter of Pedal Triangle.)?

Incenter of a Triangle

Orthocenter of a Triangle

The orthocenter of the triangle PAB is

In an acute-angled triangle ABC, tanA+tanB+tanC

Pedal triangle || Ambiguous case

If the orthocenter of an isosceles triangle lies on the incircle of the triangle then A) the base angle of the triangle is cos^-1 2/3 B) the triangle is acute C) the base angle of the triangle is tan^-1 (sqrt5/2) D) If S, I are the circumcentre and incentre and R is circumradius then SI/R=1/3

Which of the following pieces of data does not uniquely determine an acute-angled triangle ABC (R being the radius of the circumcircle)?

Pedal Triangle and Ambiguous Case