Wahaii para suhu² di brainly, keluar laahhhhhahahahahahhahahah:v

saya sangat membutuhkan ilmu kalian

• yang ngga bisa njawab gak usah ngejawab ya gvlkk
• jawab semua yah :)

Wahaii para suhu² di brainly, keluar laahhhhhahahahahahhahahah:v

1. Diketahui:

tabung

r = 21 cm

t = 40 cm

Ditanya:

V = ?

Jawab:

V = $pi$ $r^{2}$ t

V = $frac{22}{7}$ × $21^{2}$ × 40

V = $frac{22}{7}$ × 21 × 21 × 40

V = 22 × 21 × 3 × 40

V = 55.440 $cm^{3}$

2. Diketahui:

tabung

V = 21.195 $cm^{3}$

t = 30 cm

$pi$ = 3,14

Ditanya

r = ?

Jawab:

V = $pi$ $r^{2}$ t

21.195 = 3,14 × $r^{2}$ × 30

21.195 ÷ 30 = 3,14 $r^{2}$

706,5 = 3,14 $r^{2}$

$r^{2}$ = 706,5 ÷ 3,14

$r^{2}$ = 225

r = $sqrt{225}$

r = 15 cm

3. Diketahui:

tabung

V = 39.250 $cm^{3}$

r = 25 cm

$pi$ = 3,14

Ditanya:

t = ? (di soal yg ditanya r, tp itu udh diketahui jd cari t aja)

Jawab:

V = $pi$ $r^{2}$ t

39.250 = 3,14 × $25^{2}$ × t

39.250 = 1962,5t

t = 39.250 ÷ 1962,5

t = 20 cm

4. Diketahui:

kerucut

t = 12 cm

r = 7 cm

Ditanya:

V = ?

Jawab:

V = $frac{1}{3}$ $pi$ $r^{2}$ t

V = $frac{1}{3}$ × $frac{22}{7}$ × $7^{2}$ × 12

V = $frac{1}{3}$ × $frac{22}{7}$ × 7 × 7 × 12

V = 22 × 7 × 4

V = 616 $cm^{3}$

5. Diketahui:

kerucut

V = 4.620 $cm^{3}$

r = 21 cm

Ditanya:

t = ?

Jawab:

V = $frac{1}{3}$ $pi$ $r^{2}$ t

4.620 = $frac{1}{3}$ × $frac{22}{7}$ × $21^{2}$ × t

4.620 = $frac{1}{3}$ × $frac{22}{7}$ × 21 × 21 × t

4.620 = 22 × 21 × t

4.620 = 462t

t = 10 cm

6. Diketahui:

kerucut

V = 5.544 $cm^{3}$

t = 27 cm

$pi$ = $frac{22}{7}$

Ditanya:

r = ?

Jawab:

V = $frac{1}{3}$ $pi$ $r^{2}$ t

5.544 = $frac{1}{3}$ × $frac{22}{7}$ × $r^{2}$ × 27

5.544 = $frac{22}{7}$ × $r^{2}$ × 9

616 = $frac{22}{7}$ × $r^{2}$

$r^{2}$ = 616 × $frac{7}{22}$

$r^{2}$ = 196

r = $sqrt{196}$

r = 14 cm

7. Diketahui:

bola

r = 21 cm

Ditanya:

a. luas = ?

b. volume = ?

Jawab

a. L = 4 $pi$ $r^{2}$

L = 4 × $frac{22}{7}$ × $21^{2}$

L = 4 × $frac{22}{7}$ × 21 × 21

L = 4 × 22 × 3 × 21

L = 5.544 cm

b. V = $frac{4}{3}$ $pi$ $r^{3}$

V = $frac{4}{3}$ × $frac{22}{7}$ × $21^{3}$

V = $frac{4}{3}$ × $frac{22}{7}$ × 21 × 21 × 21

V = 4 × 22 × 21 × 21

V = 88 × 441

V = 38.808 $cm^{3}$

8. Diketahui:

bola

L = 308 cm

$pi$ = $frac{22}{7}$

Ditanya:

r = ?

Jawab:

L = 4 $pi$ $r^{2}$

308 = 4 × $frac{22}{7}$ × $r^{2}$

77 = $frac{22}{7}$ × $r^{2}$

$r^{2}$ = 77 × $frac{7}{22}$

$r^{2}$ = $frac{49}{2}$

r = $frac{7sqrt{2} }{2}$ cm (sepertinya salah soal, angkanya jelek)

klo masih ga ngerti bisa tanya di komen

tolong jadiin jawaban terbaik, cape ngetiknya

terima kasih