function calculateAreaOfFigures(input) {
    let figure = input[0];
    let area;
    if (figure === 'square') {
        let a = Number(input[1]);
        area = a * a;
    } else if (figure === 'rectangle') {
        let a = Number(input[1]);
        let b = Number(input[2]);
        area = a * b;
    } else if (figure === 'circle') {
        let r = Number(input[1]);
        area = Math.PI * r * r;
    } else {
        let b = Number(input[1]);
        let h = Number(input[2]);
        area = 0.5 * b * h;
    }
    console.log(area.toFixed(3));
}