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Answer:
72 meter square
Step-by-step explanation:
area of 1st wall = area of 3rd wall
area of 2nd wall = area of 4th wall
area of 1st wall = l × b
= 7 m × 3 m
= 21 meter square
area of 1 st wall and 3 rd wall = 21 m + 21 m
= 42 meter square
area of 2nd wall = l × b
= 5 m × 3 m
= 15 meter square
area of 2 nd wall and 4 th wall = 15 m +15 m
= 30 m
area of 4 walls = 42 m + 30 m
=72 meter square
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