JAMB - Mathematics (2007 - No. 45)
The area of a square is 144 sqcm. Find the length of the diagonal.
13 cm
12√2 cm
12 cm
11√3 cm
Explanation
Area of a square = x * x
144 = x2
√144 = x
12 = x
But d2 = 122 + 122
= 144 + 144
= 288
d = √288
= √144 x 2
= 12√2
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