The fomula for the surface area, S, of a cylinder, is S = 2nr2 2nrh, where his the height of the cylinder, and r is the radius of the base of the cylinder.

S = 2πr² + 2πrh = 2πr(r + h)

Step-by-step explanation:

The formula for the surface area of a cylinder is the sum of the area of the base and the lateral faces.

Mathematically,

surface area = base area + lateral area

A cylinder has 2 base which are circular therefore, the sum of the area of the base is πr² + πr² = 2πr².

The lateral area is the curved surface area of the cylinder which is the multiplication of the height and the circumference .  

curved surface area = h × circumference = 2πrh

surface area = 2πr² + 2πrh = 2πr(r + h)

S = 2πr² + 2πrh = 2πr(r + h)

The surface area can be calculated if you know the height of the cylinder and the radius. example r = 5 m and h = 10 m

Using the formula

S = 2πr² + 2πrh = 2πr(r + h)

S= 2 × π × 5(5 + 10)

S = 10π(15)

S = 150π m²

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.