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Answer:
3km
Explanation:
The shape is a Trapezium
Area of a Trapezium= ½ (a + b) h
13.5 = ½ x (6.9 + 2.1) x h
13.5 = ½ x 9 x h
13.5 = 9h ÷ 2
9h = 2 x 13.5
9h = 27
h = 27 ÷ 9
h = 3km