Question

9. The diameter of the wheel of a car is 77 cm. How many revolutions will it make to travel 121 km
10. The diameter of a semi-circular protractor is 7 cm. Find its perimeter.
11. The diameter of two circular plates are respectively 10 cm and 24 cm. What is the diameter of the
has area equal to the combined area of the two given plates ?
2. A wire of length 66 cm is bent into the shape of a circle. Find its area. If the same wire is bent in
of a square, what will be its area ? Which figure encloses more area, the circle or the square ? Tal
13. A wire when bent in the form of a square, enclosed an area of 484 cm2. If it would be bent in
circle, find the area enclosed by it.
14. Which has the greater area, a square of a perimeter 44 cm or a circle of circumference 44 cm and
15. From a rectangular metal sheet of sides 30 cm and 40 cm, a circular sheet as big as possible is
area of the remaining sheet.
(Hint: Biggest possible circular sheet will be of diameter equal to the side 30 cm.]
ont of radius 14 cm Mary cut two circles of radius 3.5 cm and a rect​

Answer 1

Step-by-step explanation:

Let the number of revolution be x

x∗ circumference of wheel = Area Covered

x∗2πr=121m

x∗2×

7

22

×

2

77

=12100cm

x∗

14

44×77

=12100cm

x∗

14

3388

=12100

x=

242

12100

=50

Hence the wheel of car takes 50 revolutions.