1 answer:
EF = 45
Step-by-step explanation:
Area if Trapezium = 
Median = 
Median = 5x
5x = 1/2 ((x + 3) + 78)
5x = (x + 81) / 2
10x = x + 81
9x = 81
x = 9
EF = 5x
EF = 5(9)
EF = 45
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Answer:
Step-by-step explanation:
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