Home » The area of a circle is 38.5cm2. Find its diameter [take (pi = frac{22}{7})]

The area of a circle is 38.5cm2. Find its diameter [take (pi = frac{22}{7})]

The area of a circle is 38.5cm2. Find its diameter [take (pi = frac{22}{7})]
  • A.
    22cm
  • B.
    14cm
  • C.
    7cm
  • D.
    6cm
Correct Answer: Option C
Explanation

(pi r^2 = 38.5\
frac{}{} = r^2 = 38.5\
r^2 = frac{38.5 times 7}{22}\
r = sqrt{12.25} = 3.5\
diameter = 2r = 2 times 3.5 = 7cm)

Related:  The venn diagram shows a class of 50 students with the games they play. How...