```go
package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	reader := bufio.NewReader(os.Stdin)
	writer := bufio.NewWriter(os.Stdout)
	defer writer.Flush()

	var t int
	fmt.Fscan(reader, &t)

	for i := 0; i < t; i++ {
		var n, m, k int
		fmt.Fscan(reader, &n, &m, &k)

		rows := n
		if k < rows {
			rows = k
		}

		cols := m
		if k < cols {
			cols = k
		}

		fmt.Fprintln(writer, rows*cols)
	}
}
```