Question

The Olympic symbol comprising five interlocking rings represents the union of the five continents of the world and the meeting of athletes from all over the world at the Olympic games. In order to spread awareness about Olympic games, students of Class-X took part in various activities organised by the school. One such group of students made 5 circular rings in the school lawn with the help of ropes. Each circular ring required 44 m of rope. Also, in the shaded regions as shown in the figure, students made rangoli showcasing various sports and games. It is given that △OAB is an equilateral triangle and all unshaded regions are congruent. Based on above information, answer the following questions :

If the area of a sector of circle of radius 36 cm is 54π cm², then the length of the corresponding arc of the sector is :

The diameter of a wheel is 63 cm. The distance travelled by the wheel in 100 revolutions is :

In the given figure, the shape of the top of a table is that of a sector of a circle with centre O and ∠ AOB = 90°. If AO = OB = 42 cm, then find the perimeter of the top of the table.