Each square on a topo map represents 1 square kilometer. To calculate the area of a region on the map, count the number of full squares and half squares within the boundaries. Express the total area by adding up the full and half squares and writing the amount in square kilometers.

1. Topo Maps
MEASUREMENT OF AREA
By Jonathan k

2. Things to remember
 EACH SQUARE IN THE TOPO MAP MEASURES 2 SQUARE
CENTIMETRES.
 TWO CENTIMETRES ON MAP ARE EQUIVALENT OF ONE
KILOMETRE ON THE GROUND.
 THEREFORE EACH SQUARE IN THE TOPO MAP
REPRESENTS
 2CENTIMETRE X 2 CENTIMETRE = 2 SQUARE CENTIMETRE
 OR
 1 SQUARE KILOMETRE [1 KILOMETRE X 1 KILOMETRE]
 THUS EACH GRIS SQUARE REPRESENTS ONE SQUARE
KILOMETRE AREA.

3. CALCULATING THE AREA
 QUESTION MAY BE PUT TO YOU ON
CALCULATING A DEFINITE AREA ON THE
TOPO MAP.
 INDICATION MAY BE GIVEN ON WHICH
AREA AS
 - THE AREA BELOW DANTRAL VILLAGE
 OR
 THE AREA TO THE LEFT OF THE GRID 0318

4. THE AREA CAN BE CALCULATED BY
COUNTING THE NUMBER OF GRIDS IN
THE INDICATED REGION.
COUNT THE COMPLETE SQUARES
CONTAINED WITHIN THE MENTIONED
REGION FIRST.

5. SQUARES THAT CAN BE TAKEN AS
HALF THE GRID ARE CONSIDERED AS
½ SQUARE.
ADD ALL THE SQUARES AND YOU GET
THE TOTAL AREA OF THE CONCERNED
PORTION IN SQUARE KILOMETRES.

6. THE STEPS IN THE ANSWER CAN BE –
NUMBER OF COMPLETE SQUARES=
NUMBER OF HALF SQUARES =
THEREFORE TOTAL NUMBER OF
SQUARES =
THUS THE TOTAL AREA =
_________ SQUARE KILOMETRES