tolong jawab nomer 11 12 13 pakai cara!!!

11
•Luas l = 1/2 × 14 × 14 × 22/7 = 14 × 22 = 308 cm2
•Luas ll {×2} = 2 × 1/2 × 7 × 7 × 22/7 = 7 x 22 = 154 cm2
•l + ll = 308 + 154 = 462 cm2

12
•《arsir》Luas = 20 × 20 = 400 m2
•《non-arsir》Luas l = 1/2 × 20 ×8 = 10 × 8 = 80 m2
Luas ll = 1/2 ×10 × 10 × 3,14 = 1/2 × 314 = 157 cm2
arsir - non-arsir = 400 m2 - ( 80 + 157 ) = 400 - 237 = 163 cm2

13
Luas l = 1/2 × 21 × 16 = 21 × 8 = 168 dm2
luas 1/3 lingkaran {×2} = 1/3 × 2 × 10 ×10 × 3,14 = 1/3 × 2 × 314 = 1/3 × 628 = 209,33... dm2
l + ll = 168 + 209 = 377 dm2

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