A parallelogram ABCD has area 48 sqcm. If the length of CD is 8 cm and that of AD is s cm, then which one of the following is necessarily true?
Explanation:
Area of parallelogram = Base × Height
∴ 48 = 8 × Height
∴ Height = 6 cm
If the parallelogram is a rectangle, AD is its height. In that case, s = 6.
Otherwise, using Pythagoras theorem, AD > 6 or s > 6.
Therefore, s ≥ 6.
Hence, option (b).
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