import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.DecimalFormat;

/**
 * Created by ChaosFire on 17.11.2017 г.
 */
public class ResurrectionSecond {

    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        int phoenixCount = Integer.parseInt(reader.readLine());
        StringBuilder output = new StringBuilder();
        for (int i = 0; i < phoenixCount; i++) {
            double bodyLength = Double.parseDouble(reader.readLine());
            String width = reader.readLine();
            double bodyWidth = Double.parseDouble(width);
            double wingLength = Double.parseDouble(reader.readLine());

            double years = bodyLength * bodyLength * (bodyWidth + 2 * wingLength);
            DecimalFormat decimalFormat = getFormat(width);
            output.append(decimalFormat.format(years)).append(System.lineSeparator());
        }
        reader.close();
        System.out.print(output);
    }

    private static DecimalFormat getFormat(String input) {
        int accuracy;
        String[] data = input.split("\\.");
        if (data.length < 2) {
            return new DecimalFormat("0");
        } else {
            accuracy = data[1].length();
        }
        StringBuilder pattern = new StringBuilder("0.");
        for (int i = 0; i < accuracy; i++) {
            pattern.append("0");
        }
        return new DecimalFormat(pattern.toString());
    }
}