Tolong bantu ya no 8,9,10,, pakai cara, secepatnyq yh, besok di kumpulin

8. l = 21 × 21 = 441 dm2
ll = diameter = 21 jr = 21 ÷ 2 = 10,5 L = 10,5 × 10,5 × 3,14 = 346 dm2 = 441 dm2 - 346 dm2 = 95 dm2

9. l = diameter = 21 jr = 21 ÷ 2 = 10,5 L = 10,5 × 10,5 × 3,14 = 346 dm2
ll = diameter = 10 jr = 10 ÷ 2 = 5 L = 5 × 5 × 3,14 = 78,5 dm2 = 346 - 78,5 = 267,5 cm2

10. l = 17 cm × 14 dm = 17 cm × 140 cm = 2.380 cm2
ll = diameter = 14 jr = 14 ÷ 2 = 7 L = 1/2 × 70 × 70 × 22/7 = 35 × 10 × 22 = 7.700 cm2 = 2.380 + 7.700 = 10.080

semoga bermanfaat dan jangan lupa follow ya