Answer:
c
Step-by-step explanation:
Well lets set up an equation 2 problems per second yields

for every second, x.
Now if we want the problems solved, y it will be equal to this product so

Now lets plug in 60 seconds, which is 1 minute

It can solve 120 algebra problems in 1 minute.
In most approximate way it can never be the area of the circle (Accurate area)
This is why because after creating base lines of each triangle it forms an inscribed polygon .
- Some little spaces left over each side or b_n
So
h is already approaching to r
- and b_1+b_2..b_n is approaching to the perimeter i.e 2πr
Option B