isCircular method
Implementation
bool isCircular() {
return radius4XS == 100.0 &&
radius3XS == 100.0 &&
radius2XS == 100.0 &&
radiusXS == 100.0 &&
radiusS == 100.0 &&
radiusM == 100.0 &&
radiusL == 100.0 &&
radius3XL == 100.0;
}