Sarah needs 4.4 centimeters more to reach 5 feet before her next birthday.
Answer:

Step-by-step explanation:
we know that
The area of the figure is equal to the area of rectangle plus the area of semicircle
step 1
Find the area of rectangle
The area of rectangle is equal to

where

substitute

step 2
Find the area of semicircle
The area of semicircle is equal to

we have
---> the radius is half the diameter

substitute


step 3
Find the area of the figure

Since these angles clearly form a circle and a circle is 360 degrees,
120-x+2x+16+3x-72=64+4x=360. Subtracting 64 from both sides, we get
4x=296 and by dividing both sides by 4 we get x=74
Area filled by nature books = 1/6 of 9 feet = 1/6 x 9 = 3/2 feet.
Number of nature books = 3/2 / 3/5 = 2.5 ≈ 3 books.