Question

1)four congruent circular holes with a diameter of 2in were punched out of a piece of paper,what is the area of the paper that is left use 3.14pi

A)80.94
B)90.36
C)93.50
D)106.06
and can someone explain how to find the answer for these type of problem?

Answer 1

80.94 is the answer

Explanation:

Answer 2

For this case we first calculate the area of the complete rectangle.
We have then:
A1 = (8.5) * (11)
A1 = 93.5
Then, we calculate the area of each circle:
A2 = pi * r ^ 2
A2 = (3.14) * (2/2) ^ 2
A2 = 3.14
The total area is given by:
A = A1 - 4 * A2
A = 93.5 - 4 * (3.14)
A = 80.94 in ^ 2
Answer:
A) 80.94