how to find area of topographical map in km

Following is an example for finding out area of one grid square on Topographic map:

• First find out the scale of the map.
• For example, if a topographic map has a scale of 1:50 000. To find out the area, we will have to find the scale.
• If the scale of the map in RF is 1:50 000, then each cm represents 0.5km.
• Length: 2cm x 0.5km = 1.0 km.
• Width: 2cm X 0.5 km = 1.0km.
• Area of One Grid Square = 1.0km x 1.0km = 1.0 sq. km

Based on the area of the one grid square km, you will be able to find the area of a topographic map.