What does △ 224 in grid square 2706 indicates?

1. The height of a particular point
2. Triangulated height - showing the height of a point surveyed by the triangulated method is 224m
3. Triangulation survey showing the height of a point of 224m
4. Approximate height of the point is 224 m

What does the number 381 indicate in grid square 4388?

1. Approximate height is 381
2. Relative height
3. Spot height showing the height of a particular point above sea level is 381 m
4. Spot height showing the height of that place is 381

Which drainage pattern is seen in grid square 4196?

1. Dendritic
2. Trellised
3. Radial
4. Intermittent

Which drainage pattern is seen in grid square 4085 and 4086?

1. Trellised
2. Dendritic
3. Radial
4. Intermittent