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Answer:
the wall is a trapezium
area of a trapezium is
= ½×(sum of parallel sides)×(height)
= ½×(7.5+2.5)×12
= 10×6
= 60m²
9m² uses 1 litre
1m² uses 1/9 litres
60m² uses (1/9×60) litres
1/9×60
=⅓×20
=20/3
= 6.67 litres (approx.)
Step-by-step explanation:
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