Estimate the fraction of oak trees in the park.

The fraction is 1/8

Step-by-step explanation:

see the attached figure to better understand the problem

Observing the pie chart

The approximate central angle of trees that are oak is about 45°

Divide 45°/360°=1/8

therefore

The fraction is 1/8

d 25 pi/6

step-by-step explanation:

the diameter is 10 inches

the radius is 1/2 of the diameter or 5 inches

the area of the circle is

a = pi r^2

  = pi 5^2

  = 25 pi

the slice is 60 degrees of the entire circle.

60 degrees out of 360   60/360 = 1/6

the area of the slice is 1/6 of the circle

a slice = 1/6 a circle

a slice = 1/6 * 25 pi