Question

radius = 4.25
diameter = 8.5
area = 56.72
circumference = 26.69
radius =
diameter =
area =
circumference =

Explanation:

Step1: Recall diameter - radius relation

The diameter $d$ of a circle is twice the radius $r$, i.e., $d = 2r$. Given $r=4.25$, then $d=2\times4.25 = 8.5$.

Step2: Calculate the area of the circle

The area formula of a circle is $A=\pi r^{2}$. Substitute $r = 4.25$ into the formula: $A=\pi\times(4.25)^{2}=\pi\times18.0625\approx3.14\times18.0625 = 56.71625\approx56.72$.

Step3: Calculate the circumference of the circle

The circumference formula of a circle is $C = 2\pi r$. Substitute $r=4.25$ into the formula: $C=2\times\pi\times4.25=8.5\pi\approx8.5\times3.14 = 26.69$.

Answer:

Radius = $4.25$
Diameter = $8.5$
Area = $56.72$
Circumference = $26.69$