Question

If the ratio of circumference to area of a circle is 2:5. then what is the diameter of the circle​

Answer 1

Answer:

10 units

Step-by-step explanation:

WKT

Area of a circle = π * r * r

Circumference of a circle = 2 π r

Given

Circumference : Area = 2 : 5

2 π r : π * r * r = 2 : 5

2 : r = 2 : 5

Therefore r = 5 units

Now We Know That d = 2 r

d = 2 * 5

d = 10 units

Hope it Helps

Answer 2

Answer:

D=10cm

Step-by-step explanation:

circumference is given by; 2πr

area is given by; πr^2

ratio of C: A =2:5

therefore; C/A =2/5

2πr/πr^2=2/5

2/r=2/5

2r= 10

but 2r =D

therefore D= 10cm