meant to calculate the length of a polyline, to help solve level 7.10 in the Android game Pythagorea

pythagorea7-10.js

// calculates the total length of the polyline on Pythagorea, puzzle 7.10

var polyline = [[4,3], [1,2], [2,1], [1,1], [1,3],
                [1,1], [2], [1,2], [2,1], [1,3],
                [1,1], [1], [1,1], [2], [1]];

var grandtotal = 0;

function findc(a, b) {
    var a2pb2 = 0;
    a2pb2 += (a * a);
    a2pb2 += (b * b);
    a2pb2 = Math.sqrt(a2pb2);
    console.log(a2pb2);
    grandtotal += a2pb2;
}

for (var i = 0; i < polyline.length; i++) {
    if (polyline[i].length == 2) {
        // console.log(polyline[i]);
        findc(polyline[i][0], polyline[i][1]);
    }
    else {
        // console.log(polyline[i]);
        grandtotal += polyline[i][0];
    }
    console.log((i + 1) + " - " + grandtotal);
}

grandtotal /= 2;
console.log(grandtotal);

calculates the total length of the polyline on Pythagorea, puzzle 7.10