Question

find curved surface area and total surface area of a cylinder of height 12 m and diameter of base is 7 m​

Answer 1

Answer:

total sueface area =341

Step-by-step explanation:

given:-

h=12m

d =7 r =3.5

$as \: we \: know \\ \\ \: curved \: surface \: area \: of \: cylinder = 2\pi \: r \: h \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 2 \times \frac{22}{7 } \times 3.5 \times 12 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 2 \times 22 \times 0.5 \times 12 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 44 \times 6 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 264$

now,

for total sueface area

$total \: sueface \: area = 2\pi \: r \: (h + r) \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 2 \times \frac{22}{7} \times 3.5 \times (12 + 3.5) \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 2 \times 22 \times 0.5 \times 15.5 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: = 44 \times 7.75 \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: = 341$