Answer:
The area of the resulting cross section is 
Step-by-step explanation:
we know that
The resulting cross section is a circle congruent with the circle of the base of cylinder
therefore
The area is equal to

we have

-----> the radius is half the diameter
substitute the values

Answer:
A
Step-by-step explanation:
The correct option is (A).
Answer:
I think it's 9:50
Step-by-step explanation:
2_10 i'm guessing means 2/10, so in percentage, it would be 20%