Question

find the total surface area of a closet cylindrical tin of radius 15cm and height 20 cm​

Answer 1

Step-by-step explanation:

r = 15 , h = 20

total surface area of cylinder = 2 pi r (r + h)

= 2*(22/7)*15*(15+20)

= 2*(22/7)*15*35

= 2*22*15*5

= 44*75

= 3300

Answer 2

Answer:

Hence value of total surface area will be 3300 sq.cm

Step-by-step explanation:

In context to questions asked

We have to determine the value of total surface area of closet tin

As per questions

We have

Radius of surface = 15 cm

Height of surface = 20 cm

As we know that

Total surface area of cylinder can be determined by using formula,

$2\pi \: r(r + h)$

So for determining the value of total surface area we will put the value given in the questions in above formula

Thus we will get

$2 \times \frac{22}{7} \times 15 \times (20 + 15) \\ = > 2 \times \frac{22}{7} \times 15 \times 35 \\ = > 2 \times 22 \times 15 \times 5 \\ = > 220 \times 15 \\ = > 3300 \: {cm}^{2}$