Bantu ya Jawabannya kak:)
Penjelasan dengan langkah-langkah:
1.
K = Phi x D L = Phi x r x r
220 cm = 22/7 x D = 22/7 x 35 x 35
22/7 x D = 220 cm = 3.850 cm2
D = 22/7 : 220
= 7/22 x 220
= 70 cm
r = 1/2 D
= 35 cm
2.
L = Phi x r x r
= 22/7 x 14 x 14
= 616 cm2
3.
a.
K = Phi x D
= 3,14 x 24
= 75,36 cm
b.
K = Phi x D
= 3,14 x 8,4
= 26,376 cm
4.
a.
K = Phi x D
= 22/7 x 14
= 44 cm2
b.
K = Phi x D
= 22/7 x 21
= 66 cm
c.
K = Phi x D
= 22/7 x 56/10
= 22 x 8/10
= 22 x 4/5
= 88/5
= 17,6 cm
d.
K = Phi x D
= 22/7 x 70
= 220 m
5.
a.
L = Phi x r x r
= 3,14 x 8 x 8
= 25,12 x 8
= 200,96 cm2
b.
L = Phi x r x r
= 3,14 x 15 x 15
= 47,1 x 15
= 706,5 cm2
c.
L = Phi x r x r
= 3,14 x 22 x 22
= 69,08 x 22
= 1.519,76 cm2
d.
L = Phi x r x r
= 3,14 x 1.600
= 314 x 16
= 5.024 cm2
6.
a.
L = Phi x r x r
= 22/7 x 7 x 7
= 154 cm2
b.
L = Phi x r x r
= 22/7 x 28 x 28
= 88 x 28
= 2.464 cm2
c.
L = Phi x r x r
= 22/7 x 14/10 x 14/10
= 22 x 1/5 x 14/10
= 11 x 1/5 x 14/5
= 154/25
= 6,16 cm2
d.
L = Phi x r x r
= 22/7 x 56/10 x 56/10
= 22/7 x 28/5 x 28/5
= 22 x 4/5 x 28/5
= 88/5 x 28/5
= 2.464/25
= 98,56 cm2
7.
Lp = 6 x s x s V = r x r x r
294 cm2 = 6 x s x s = 7 x 7 x7
6 x s x s = 294 cm2 = 49 x 7
s x s = 294 : 6 = 343 cm3
= 49 cm
s = akar kuadrat dari 49
= 7 cm
8. SOAL TIDAK LENGKAP