In this article you will have sums on the area of two concentric circles. These are for your guidance and hence a note to solve each numerical is also given in this article. Keep solving and practicing.
1) The perimeter of inner edge of a hollow circular disk is 11cm and the disk is 7cm wide then what is the perimeter of the outer edge of the disk?
(a) 55cm (b) 50cm (c) 32cm (d) none of these
Answer:- 1) = (a) 55cm,
Note: Find the inner radius and outer radius
2) A hollow bamboo is having circular shape with its inner perimeter 99mm with a thickness of 7mm, then what will be length of rope which ties it with other bamboo?
(a) 155mm (b) 143mm (c) 132mm (d) 164mm
Answer: - 2) = (b) 143mm,
Note: - Find outer perimeter
3) Renuka was having a circular stamp to draw smiley face. The inner perimeter of the inner circle was 22mm and its thickness was 7mm, then what was the coloured area of the stamp?
(a) 220sq. mm (b) 700 sq. mm (c) 308 sq. mm (d) 207 sq. mm
Answer: - 3) (c) 308 sq. mm,
Note: Find area of both the circles and subtract area of inner circle from outer circle.
4) There were many circular discs made of wood with a thickness of 7cm and inner radius of 5.25cm. Then the width of the paper used to cover inner rod and outer box to hold the discs in one column before cutting?
(a) 120cm (b) 55cm (c) 110cm (d) 130cm
Answer: - 4) = (c) 110cm
Note: - Find perimeters of both circles
5) A circular sitting bench is having inner diameter of 88cm and it is 70cm wide then what will be the area occupied by the bench?
(a) 18000 sq. cm (b) 16340 sq. cm (c) 18634 sq. cm (d) can’t say
Answer: - (c) 18634 sq. cm
Note: - The area of outer circle
6) A toy train is having circular track with inner perimeter of 55 cm. And the width of the toy train track is 7 cm. To decorate this toy train on the occasion of a party a glittery less was pasted in both the sides of the tracks. Then what is the length of the less used for decoration?
(a) 154 cm (b) 110 cm (c) 77 cm (d) 169 cm
Note: - Find the perimeter of outer circle and add both perimeters.
Answer: - (a) 154 cm
7) A circular tent is having an inner circular play area of diameter 21m. And the width of sitting area is 7m. Then what is the diameter of the tent.
(a) 28m (b) 70m (c) 35m (d) 42m
Note: - Inner diameter + 2(width of sitting area)
Answer: - (c) 35m
8) A circular stadium is having an open space of perimeter 77m and running track of 7m. Then what is the length of the first sitting line of the stadium right near to running track?
(a) 225m (b) 350m (c) 121m (d) can’t say
Note: - Find the perimeter of outer circle of the running track.
Answer: - (c) 121m
9) A 7mm thick bangle is having inner perimeter of 88mm. Then what is the area of the inner circle drawn using the bangle?
(a) 616 sq.mm (b) 660 sq.mm (c) 788 sq.mm (d) 477 sq.mm
Note: - Find radius of inner circle and then area of the inner circle.
Answer: - (a) 616 sq.mm
10) A circular stadium is having a ground of 1.75m radius and sitting area of length 14m. Then what is the area of the sitting area of the stadium?
(a) 220sq.m (b) 770sq.m (c) 175sq.m (d) 1000sq.m
Note: - Find area of both the circles and then subtract area of inner circle from area of outer circle.
Answer: - (b) 770sq.m
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