question_answer

If the circumference is 30 cm more than the diameter of the circle, find the radius of the circle.

Answer:

According to the question, Circumference ? diameter = 30 cm 2πr ? 2r = 30 2r(π ? 1) = 30 2r\[\left( \frac{22}{7}-1 \right)=30\] \[2r=\frac{30\times 7}{15}=14\] ∴ \[r=\frac{14}{2}=7\,cm\]