Area Of Figures

function areaOfFigures(input) {
    let type = input[0];

    let result = 0;
    if (type === "square") {
        let a = Number(input[1]);
        result = a * a;
    } else if (type === "rectangle") {
        let a = Number(input[1]);
        let b = Number(input[2]);
        result = a * b;
    } else if (type === "circle") {
        let radius = Number(input[1]);
        result = Math.pow(radius, 2) * Math.PI;
    } else {
        let a = Number(input[1]);
        let height = Number(input[2]);
        result = a * height / 2;
    }
    console.log(result.toFixed(3));
}

areaOfFigures(["square", "5"])