If the Total surface area of cube is 486cm2 , it's edge is
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The length of its edge is 9 cm
.
Step-by-step explanation :
Total surface area of cube
= 6 ( side )² ∴ 6 ( side )² = 486
⇒ ( side )² = 486 / 6
⇒ ( side )² = 81
⇒ side = √ 81
⇒ side = 9
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