Jawab pls yg no 11 sampai 15 aja

11.) D = 14 dm
r =14:2 = 7 dm
t= 10 dm
volume = luas alas × tinggi
= π × r² × t
=22/7 × 7² ×10
= 22/7 × 49 ×10 =10.780/7
=1540 dm³

12.) D = 10 cm r =10:2=5 cm
T= 50 cm
volume = luas alas ×tinggi
=π×r²×t
=3,14×5²×50
=3,14×25×50
=78,5×50
=3.925 cm³

13.)Volume 1 = p×l×t
= 28×28×20
=784×20
=15.680 cm³

volume 2 =
D=28 cm
r=28:2=14cm
T=20
volume tabung =
=luas alas × tinggi
=π×r²×t
=22/7×14²×20
=22/7×196×20
=86.240/7
=12.320 cm³

volume gabungan=
=volume 1 + volume 2
=15.680 cm³+12.320 cm³
=28.000 cm³

14.)volume 1 =
D=10cm
r=10:2=5cm
volume=
=π×r²×t
=3,14×5²×7
=3,14×25×7
=78,5×7
=549,5 cm³

volume 2=
D =5+10+5=20
r=20:2=10
volume=
=π×r²×t
=3,14×10²×14
=3,14×100×14
=314×14
=4.396 cm³

volume gabungan =
volume 1 + volume 2
=549,5+4.396
=4.945,5 cm ³

15.)volume 1=
=p×l×t
=7×6×5
=210 cm³

volume 2=
D=3,5 dm
r=3,5:2
=1,75 dm
T=3 dm
volume=
=π×r²×t
=3,14×1,75²×3
=3,14×3,062×3
=9,614×3
=28,842 dm³

volume gabungan=
=volume 1 + volume 2
=210 + 28,842
=238,842 dm³

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