How can i Send Variables Value thru i2c Protocoll between 2 Arduinos.

Projects Programming
7 
// called by interrupt service routine when incoming data arrives
void receiveEvent (int howMany)
 {
 /* while (Wire.available () > 0)
  {
    char c;
    c = Wire.read ();
      if (c=='A'){
           Wire.beginTransmission (OTHER_ADDRESS);
             byte a[11] = {p3tr,p4tr,p5tr,p6tr,p7tr,p8tr,p9tr,p10tr,p11tr,p12tr,p13tr};
             Wire.write(a,11);
           Wire.endTransmission ();
    Serial.println(c);  
    }

Inside a receiveEvent you don't need beginTransmission and endTransmission. Just do the write.

And since it is an ISR don't do any serial prints. So more like:

// called by interrupt service routine when incoming data arrives
void receiveEvent (int howMany)
   {
    if (Wire.read () =='A')
      {
      byte a [11] = {p3tr, p4tr, p5tr, p6tr, p7tr, p8tr, p9tr, p10tr, p11tr, p12tr, p13tr};
      Wire.write (a, sizeof a);
      }
    }