Question

gimana kak?bantu plsss
hitunglah luas permukaan tabung dan v.tabung!
T=25
D=28​

Answer 1

Jawaban:

Luas permukaan tabung (Lp Tabung)

= (keliling lingkaran × t) + (2 × L lingkaran)

= (88 × 25) + (2 × 616)

= 2.200 + 1.232

= 3.432 cm²

Volume Tabung

= La × t

= luas alas × t

= 616 × 25

= 15.400 cm³

→ keliling lingkaran

[tex] \sf = \pi \times d[/tex]

[tex] \sf = \frac{22}{ \cancel{7} _{1}} \times \cancel{28} _{4}[/tex]

[tex] \sf = 22 \times 4[/tex]

[tex] \sf = 88 \: cm[/tex]

L lingkaran

[tex] \sf = \pi \times {r}^{2} [/tex]

[tex] \sf = \frac{22}{7} \times {( \frac{28}{2}) }^{2} [/tex]

[tex] \sf = \frac{22}{7} \times {14}^{2} [/tex]

[tex] \sf = \frac{22}{ \cancel{7} l_{1}} \times \cancel{196} _{28}[/tex]

[tex] \sf = 22 \times 28[/tex]

[tex] \sf = 616 \: {cm}^{2} [/tex]