Page 200 - Start Up Mathematics_6

In figures (a), (b) and (c) it is not difficult to judge which figure has larger area but in figure (d),

its slightly confusing. Thus, to overcome this difficulty we need to measure the region enclosed,
i.e., area of these figures.

Units of Area

Area is measured in square units. For small figures, area is usually measured in square cm and
for areas of lands and fields, we use larger units such as square metres, ares or hectares, where
1 are = 100 sq. m ; 1 hectare = 10,000 sq. m

Some important conversions

Units of Length Units of Area
1 cm = 10 mm 1 sq. cm = 100 sq. mm
1 m = 100 cm 1 sq. m = 10,000 sq. cm
1 dm = 10 cm 1 sq. dm = 100 sq. cm
1 dam = 10 m 1 sq. dam = 100 sq. m
1 km = 1,000 m 1 sq. km = 10,00,000 sq. m

Problems Related to Observation Skills

Area of Polygons

Find the area of the following figures represented by A, B, C and D assuming each square is
of length 1 unit. Record your observation in the given table. Discuss with your friends.

Figure A B C D
Area

A B

C
D

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