Неоднозначное наследование классов

#include <iostream>
#include <cmath>
using namespace std;
class Tcirculo{
float radio;
float diametro;
float area;
public:
void carea(float r){radio= r; area=(M_PI*((r*r)));}
float cdiam(float r) {diametro = 2*r; return diametro;}
float getr(){return radio;}
float getd(){return diametro;}
float geta(){return area;}

};class Trectangulo : public Tcirculo{
float altura;
public:
float calca(float h, float r){altura =h;
float arearec = getd() * h; return arearec;}
};

class Tcilindro :  public Tcirculo ,Trectangulo{
float xx,bb;
public:
Tcilindro(float a, float b) {xx=a;bb=b;}
float area_total();
};

float Tcilindro::area_total(){
int area;
area = ((2*((getd())))+calca(bb,xx));
return area;
}
int main(int argc, char *argv[]) {

return 0;
}

но проблема в следующем:

warning: direct base 'Tcirculo' inaccessible in 'Tcilindro' due to ambiguity

В функции члена 'float Tcilindro::area_total()':

error: reference to 'geta' is ambiguous
error: candidates are: float Tcirculo::geta()
error:                 float Tcirculo::geta()
error: reference to 'geta' is ambiguous
error: candidates are: float Tcirculo::geta()
error:                 float Tcirculo::geta()