NCERT Solutions Ganita Manjari Chapter 6 Exercise Set 6.1
Book page 129 Updated on2026-08-11
Q1.
The perimeter of a circle is 44 cm. What is its radius?
Answer
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Q2.
Calculate, correct to 3 significant figures, the circumference of a circle with: (i) radius 7 cm (ii) radius 10 cm (iii) radius 12 cm.
Answer
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Q3.
Calculate the length of the arc of a circle if: (i) the radius is 3.5 cm and the angle at the centre is 60°, and (ii) the radius is 6.3 m and the angle at the centre is 120°.
Answer
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Q4.
Find the perimeter of a sector (i.e., the curved portion as well as the two straight portions) of a circle of radius 14 cm and sector angle 75°.
Answer
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Q5.
Find the perimeters of the following shapes (taking the arcs to be quarter or half or three-quarters of a circle, as appropriate) (Fig. 6.14i to 6.14ix):
Answer
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Q6.
If the diameter of a car tyre is 56 cm, then: (i) How far does the car need to travel for the tyre to complete one revolution? (ii) How many revolutions does the tyre make if the car travels 10 km?
Answer
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Q7.
Find the total perimeter of all the petals in each of the given flowers. Fig. 6.15A: The centres of the arcs are the midpoints of the sides of the square Fig. 6.15B: The centres of the arcs are the vertices of the hexagon (i)
Answer
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Q8.
The ratio of the perimeters of two circles is 5:4. What is the ratio of their radii?
Answer
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