Question

if the difference between the circumference and diameter of a circle is 30 cm then what is the radius of the circle​

Answer 1

2 pi r - 2 r =30
R(2pi -2)=30
R(44/7-2)=30
R(30/7)=30
R=7 cm

Answer 2

Answer:

7cm

Step-by-step explanation:

circumference of circle =2 ×pi× r

r= radius

diameter =2×radius

according to question:

2×pi×r-2×r=30

value of pi=22/7

2×22/7×r-2r=30

44/7r-2r=30

lcm

44r-14r/7=30

30r/7=30

r=7