#include <bits/stdc++.h>
#define int long long
const int N = 2e5 + 10;
const int INF = 0x3f3f3f3f;
using namespace std;
int t;
signed main()
{
		cin >> t;
		while ( t-- )
		{
			int n , m , k;
			scanf ("%lld%lld%lld" , &n , &m , &k);
			int l = n * m - 1;
			if (l == k) printf ("YES\n");
			else printf ("NO\n");
		}
		return 0;
}