Answer:
or 
Step-by-step explanation:
The lateral area of a cylinder is calculated by the following formula

Where r is the radius of the right cylinder and h is the height
In this case we know that the diameter d of the cylinder is


Therefore the lateral area is:



Answer:
3/4
Step-by-step explanation:
sin^2(240°)
=sin^2(360-120)
=sin^2(-120)
={-sin^2(120)}
=(-
=3/4