The sum of the lengths of the radius and the diameter of a circle is 84 cm. What is the difference between the lengths of the circumference and the radius of this circle? [Use π = $\frac{22}{7}$]
Answer & explanation
Correct answer: option 3
We know that,
Circumference = 2πr
We have,
Radius + Diameter = 84 cm
Now, according to question,
R + 2R = 84
= 3R = 84
= R = 28
So, The circumference = 2πr = 2 × \(\frac{22}{7}\) × 28 = 176 cm
Now, difference between Circumference and radius is = 176 – 28 = 148 cm