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= 22/7 × 21 × 21
= 1.386 (b)
8. L = ¾ × πr²
= ¾ × 22/7 × 28 × 28
= 1848 (b)
9. L1 = s²
= 18 × 18
= 324
L2 = d1 × d2 ÷ 2
= 18 × 18 = 162
L1 - L2 = 324 - 162 = 162 (c)
10. *maaf ya saya gk tau