5.0cm
6.9cm
10.0cm
20.0cm
Correct answer is D
Area of trapezium = \(\frac{1}{2} (a + b)h\)
\(120 = \frac{1}{2} (5 + 7) \times h\)
\(120 = 6h\)
\(h = 20 cm\)
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