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8. 50 cm² × 2 = 100 cm²
9. = 3.14 × 10 cm × 10 cm
=314 cm² : 2 = 157 cm²
⇒3.14 × 4 cm ×4 cm = ⇒50.24 cm² : 2 = 25.12 CM²
=((22/7 × 28 cm ×28 cm ) : 2) - 157 cm² - 25.12 cm²
= 125.88 CM KUADRAT
10. 160 CM ²- 100 CM²
= 60 CM²