figureAreaV2

function figureAreaV2(input) {
    //Input
        let figure = input.shift();
        let n = Number(input.shift());
        let n2 = Number(input.shift());

    //Rectangle - w * h
    if (figure == 'rectangle') {
        result = n * n2;
    }
    //Square - x * x
    else if (figure == 'square') {
        result = Math.pow(n, 2);
    }
    //Circle - PI * r * r
    else if (figure == 'circle') {
        result = Math.PI * Math.pow(n, 2);
    }
    //Triangle - b * h / 2
    else if (figure == 'triangle') {
        result = n * n2 / 2;
        }
        console.log(result.toFixed(3));
    }

   figureAreaV2(['circle', 6]);