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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Geometry
4.20 The Area of a Circular Path - I

Example:
The outer and inner radii of a ring are 65 cm. and 47.5 cm. Find the area of the ring (circular path).

Solution:
Given that,
R = 65 cm and r = 47.5 cm.
The area of the ring = p(R+r)(R-r).
= 22/7 * (65 + 47.5) * (65 - 47.5)
= 22/7 * 112.5 * 17.5
= 43312.5 / 7
= 6187.5 sq cm.


Directions: Read the above example carefully and answer the following questions.

Draw 10 different rings and represent each with different color. Find the area of each of them.

Q 1: The inner radius of a ring is 42 cm. Find the outer radius if its area is given by 4312 sq cm.
42 cm
55 cm
56 cm
41 cm

Q 2: The outer and inner radii of a ring are 80 cm and 69.5 cm. Find its area.
5621 sq cm
4933.5 sq cm
3933.5 sq cm
5632 sq cm

Q 3: The outer and inner radii of a ring are 17.5x cm and 15.75x cm. Find x if its area is given by 731.5 sq cm.
3 cm
2 cm
4 cm
1 cm

Q 4: The outer and inner radii of a ring are 50 cm and 29 cm. Find its area.
5168 sq cm
5126 sq cm
5124 sq cm
6526 sq cm

Q 5: The outer and inner radii of a circular path are (138/6) cm and (129.6/6) cm. Find its area.
192.6 sq cm
196.24 sq cm
192.4 sq cm
169.24 sq cm

Q 6: The outer radius of a ring is 25 cm. Find the inner radius if its area is given by 108.46 sq cm.
24.3 cm
25.5 cm
21.2 cm
25.1 cm

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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