30.
3/4 is equal to 75%, so take 75% of 40 by multiplying .75 by 40 to get 30
15.5 I believe but don’t hold me to it!
The area is another way of say perimeter. it's the inside area of the rectangle
Answer:

Step-by-step explanation:
We need to find the lateral surface area of the cylinder of radius 6 cm and height of 10 cm.
We need to find the lateral surface area of the cylinder. The formula for the lateral surface area of a cylinder is given by :

So, the lateral surface area of the cylinder is
.