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1. The three sides of a triangular field are 20 metres, 21 metres and 29 metres long respectively. The area of the field is :

Solution:
Since (20)2 + (21)2 = (29)2
So, it is a right-angled triangle with base = 20 m and height = 21 m
∴ Area = (12×20×21)   m2 = 210 m2

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