Question

Q.No.:21
If the perimeter of a circle is
numerically equal to the area of the
circle, then the radius is:
(a) 2 units
(b) 3 units
(c) 1 unit
(d) none of these​

Answer 1

Answer:

as we know that,

perimeter of circle = 2 π r

area of circle = πr²

given that the perimeter and area of circle are numerically equal

therefore,

πr² = - 2πr²

r²- 2r=0

r(r - 2)

r = 0 or r = 2