Question

PLSSSS HELP The area of a cylinder varies jointly with the radius and the height. When the radius is 3 and the height is 6 the area is 36π. Find the are when the radius is 4 and the height is 5

Answer 1

Answer:

167.55

Step-by-step explanation:

so it varies jointly so

A-area if cylinder

so

$a \: \alpha \: \pi \: r \: ^{2} h$

so

$a = k\pi \: r^{2}h$

where k is the constant

so apply the first set of values to get k=2/3

then substitute the k with the second set of values