tolong dijwb y semuanya dari nomor 9sampai15 pkai caranya oke nyari luas

9.) bangun 1 = L = π × D
= 22/7 × 5 × 5,5 = 192, 5
Bangun 2= L = π × D
= 22/7 × 5× 5,5 = 192,5
Jadi = 192,5 + 192,5 = 385

10.) Luas persegi panjang = p × l
=17 × 14 = 238
Luas lingkaran = π × r² = 22/7 × 7 × 7 =1.078/7 = 154 cm
= 238 - 154 = 392 cm

11.) Luas lingkaran = π × r² = 22/7 × 14 × 14 = 44 × 14 = 616 cm²
Luas lingkaran = π × r² = 22/7 × 7 × 7 = 154 cm²
= 616 + 154 = 770 cm²

12.) B1 = a × t : 2 = 8 × 20 : 2 = 80m
B2 = 3,14 × 10 ×10 = 314 m²
B3 = s × s = 20 × 20 = 400 m²
= 400 - 314 - 160 = 26 m²

13.) L = π × r² = 3,14 × 10 × 10 = 314 : 2 = 157 dm²
L layang² =d1 × d2 : 2 = 21 × 16 : 2 = 336 dm² : 2 = 168
= 157 dm² + 168 dm² + 314 dm² = 325 dm²

14.) L = 22/7 ×14 × 14 + 1/2 × 14 × 14 = 8722

15.) L = 1/2 × d1 × d2 = 1/2 × 7 × 7 = 14 × 1/2 = 7

MAAF YA KALO SALAH

9)5,5+5,5+10=21
r=d:2=21:2=10,5
L=π×r²=22/7×10,5×10,5=346,5
r=d:2=10:2=5
L=π×r²=3,14×5×5=78,50
346,5-78,50=268
10)L=p×l=17×40=2380
14 dm=140cm
r=d:2=140:2=70
L=L1/2O=1/2×π×r²=1/2×22/7×70×70=7700
2380+7700=10800
11)L=1/2×22/7×14×14=308
d=r×2=7×2=14
L=1/2×22/7×7×7=77
L=1/2×22/7×7×7=77
308+77+77=462
12)L1=s×s=20×20=400
L2=1/2×π×r²=1/2×3,14×10×10=157
L3=a×t:2=20×8:2=80
400-(157+80)=163
13)L1=1/2×π×r²=3,14×10×10=157
L2=1/2×d¹×d²=21×16:2=168
157+168=325
14)L1=3/4O=3/4×22/7×14×14=462
L2=a×t:2=14×14:2=98
462+98=560
15)L1=1/2×d¹×d²=35×14:2=245
L2=π×r²=22/7×17,5×17,5=962,5
r=d:2==35:2=17,5
962,5-245=717,5