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61. A wheel has diameter 84 cm. Find how many complete revolutioas must it make to cover 792 m.

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62. In the following figure is a sector of a circle of radius 14 cm. Find the perimeter of this sector.

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63. In the following figure is a sector of a circle of radius 21 cm. Find the perimeter of this sector.

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fraction numerator 25 straight pi over denominator 48 end fraction

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65. In the following Fig. 12.49, the length of an arc AB = 20 π cm is a sector of a circle, find the radius of the circle.

Fig. 12.49

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66. What is the ratio of the area of a sector of angle 30° in a circle and that of the complete circle.

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67. An arc of a circle is of length 5 π cm and the sector it bounds has an area 20 π cm². Find the radius of the circle.

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68. The perimeter of a sector of a circle of radius 8 cm is 25 cm. What is the area of sector.

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69. In the given Fig. 12.50, the area of sector OAYB is 462 cm². Find the radius of a circle.

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70. A pendulum of wall clock swings through an angle of 30° and describes an arc of length 8.8 cm. Write length of pendulum.

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