Question : The circumferences of the two circles are touching externally. The distance between their centres is 12 cm. The radius of one circle is 7 cm. Find the diameter (in cm) of the other circle.

Option 1: 12

Option 2: 10

Option 3: 8

Option 4: 5

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 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