array of pointers to char

this:

const char *messageType[9] = {
  "?ledStatus=", "?alarmState=", "?garageState=", "?guestGarageState=", "?weatherCondition=", "?outsideTemp=", "?outsideHumid=", "?airconSetpoint=", "?epochTime="};

//
void setup()
{
  Serial.begin(9600);
  Serial.println(" ");
  Serial.println(sizeof(messageType[1]));

}

void loop()
{

}

returns the sizeof the pointer (as expected)... how can I get the size of the string element of the array?

strlen()

thanks!