Question : If the circumference of a circle is 13.2 cm, then what is its radius?
Option 1: 1.7 cm
Option 2: 6 cm
Option 3: 21 cm
Option 4: 2.1 cm
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Correct Answer: 2.1 cm
Solution : Given: Circumference of the circle = 13.2 cm Let the radius be $r$. We know the circumference of the circle = $2\pi r$ ⇒ $13.2 = 2\pi r$ ⇒ $13.2=2× \frac{22}{7}×r$ ⇒ $r = \frac{13.2\times 7}{2\times 22}$ ⇒ $r = 2.1$ cm Hence, the correct answer is 2.1 cm.
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Question : Thrice the length of the diameter of a circle is 10 cm less than its circumference. What is the radius of the circle? [Use $\pi=\frac{22}{7}$]
Option 1: 28 cm
Option 2: 14 cm
Option 3: 70 cm
Option 4: 35 cm
Question : The difference between the circumferences of the two circles is 4.4 cm and the radius of the smaller circle is 1.4 cm. The radius of the larger circle is:
Option 1: 4.1 cm
Option 2: 0.7 cm
Option 3: 2.1 cm
Option 4: 3.5 cm
Question : 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 $\pi=\frac{22}{7}$]
Option 1: 156 cm
Option 2: 172 cm
Option 3: 148 cm
Option 4: 128 cm
Question : A wire is in the form of square with side 44 cm. It is bent to form a circle. What is the radius of the circle?
Option 2: 21 cm
Option 3: 16 cm
Option 4: 32 cm
Question : The area of a circle is 1386 cm2. What is the radius of the circle? [Use $\pi=\frac{22}{7}$ ]
Option 1: 21 cm
Option 2: 7 cm
Option 3: 14 cm
Option 4: 18 cm
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