Question

The map of a rectangular field drawn to a scale of
1 : 20000 measures 20 cm by 15 cm. Calculate the
actual area of the field in sq km (km). (ICSE)
• ​

Answer 1

Answer:

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Step-by-step explanation:

well to start convert the 2.7 cm into km

1 km= 1000m

1 m = 100 cm

therefore  

1 km= 1000× 100

= 100000 cm  

therefore  

100000 cm =1 km

but  

1 cm = 1100000 km

therefore  

2.7 cm= 1100000× 2.7

= 2.7 ×10−5 km

therefore using a personal trick

map:actual

1 km : 20000 km

↓: ↓

2.7×10−5 km: 20000×2.7×10−5 km

=2.7×10−5 km: 0.54 km

therefore the actual distance between these 2 points is 0.54 km