public override double Area( )
{
var semiperimeter = Perimeter( ) / 2.0;
var multiplication = SidesLengths.Aggregate(
semiperimeter,
(accumulate, currect) => accumulate *= semiperimeter - currect
);
return(Math.Sqrt(multiplication));
}
public override double Perimeter( )
{
return(SidesLengths.Sum());
}
