alleryThe surface area of a cube is 600 cm2. What is the length of its side?
A6 cm
B15 cm
C20 cm
D10 cm
Answer & Solution
Correct answer: D. 10 cm
1. Surface area = 6l2, so 6l2 = 600.
2. l2 = 100, so l = 10 cm.
3. 6 cm comes from dividing wrongly and 20 cm from doubling.
_Source: NCERT Class 8 Mathematics, Chapter 9 Mensuration, Exercise 9.2_
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