Question

if the circumference and area of a circle are numerically equal then what is the radius of the circle equal to
a) r=1
b)r=7
c)r=2
d)r=c​

Answer 1

Answer:

Required correct option is ( c ).

Step-by-step explanation:

From the properties of circle :

• Area of circle = πr^2
• Circumference of circle = 2πr

According to the question :

Area and circumference of a circle are numerically equal, here we have to neglect the unit. This cannot happen practically, but here we are talking about the numeric values only, which can be equal.

Thus,

= > Area of circle = Circumference of circle

= > πr^2 = 2πr

= > r^2 = 2πr / π

= > r^2 = 2r

= > r^2 / r = 2

= > r = 2

Hence the required correct option is ( c ).

Answer 2

Answer:

Step-by-step explanation:

Option D Is accurate answer !

Because,

= > Area of circle = Circumference of circle

= > πr^2 = 2πr

= > r^2 = 2πr / π

= > r^2 = 2r

= > r^2 / r = 2

= > r = 2