a) radius 21 cm. 1386cm²
b) diameter 14cm. 154cm2
) if the circumference of a circle is 132 cm, find its radius and area. 21cm, 1386cm²
) If the area of a circle is 15400 cm², find its radius and circumference. 70cm, 440cm
) if the wheel of a bicycle has a diameter of 84cm, find
a) the distance travelled by the cyclist after one rotation of the wheel. 264cm
b) the number of rotations of the wheel if the cyclist covers a distance of 1.65 km. 625
) A 72cm long piece of wire is bent into the form of a semi circular are bounded by its diameter. Find the radius. 14cm
) A metal wire is bent in the shape of a square of area 484cm². If the same wire is bent to form a circle, find the area enclosed. 616cm²
) A wire is in the shape of a circle of area 3850 cm². If the same wire is bent in the form of a square, find the area of the square. 3025cm²
) A circular park of diameter 30 m is surrounded by a circular path of uniform width 5 m. Find the area of the path. 550m²
) The area of the ring between two concentric circles is 990 cm². Find the radii of the two circles if their sum is 35cm. 22cm, 13cm
) A garden is made up of a rectangular patch of grass and two semi-circular ponds, as shown in the figure. If the length and width of the rectangular patch are 24 m and 14 m respectively,
a) the perimeter of the garden. 92m
b) the total area of the garden. 490m²
) A rectangle of length 35 cm and width 28cm has a semicircle cut out from each of its two sides, as shown.
) Find the circumference and area of a circle of
a) radius 14 cm. 88cm, 616cm²
b) radius 2.1 m. 13.2m, 13.86m²
c) diameter 35 cm. 110cm, 962.5cm²
d) diameter 77 cm. 242cm, 4658.5 cm²
) Find the radius of a circle and area if its circumference is
a) 176cm. 28cm, 2464cm²
b) 11 meter. 1.75m, 9.625m²
c) 16πcm. 8cm, 64π cm²
) Find the diameter of a circle and its circumference if its area is
a) 6.16 m². 2.8m, 8.8m
b) 394.24cm². 22.4cm, 70.4cm
c) 25π cm. 10cm, 10π cm
) A bicycle wheel is 1 m 26cm in diameter. Calculate
a) the distance travelled in one rotation of the wheel. Em 96cm
b) the number of rotations of the wheel needed to cover 1.98 km. 500
) A 54 cm long piece of wire is bent into the shape of a semi-circular are bounded by its diameter. Find its radius. 10.5cm
) A wire is bent in the form of a square of area 1936 cm². If the same wire is bent to form a circle, find the radius of the circle and area enclosed. 28cm, 2464cm²
) A wire is in a circular shape of area 5544 cm². If the same wire is bent in the shape of a square, find the length of a side of the square and its area. 66cm, 4356 cm²
) A circular pond of diameter 28 m is surrounded by a path 7m wide . Find the area of the path. 770m²
) Find the area of a 2m wide circular path surrounding a circular plot of radius 20m. 264m²
) The area of the ring between two concentric circles is 3168 cm². Find the radius of the two circles if
a) their sum is 42cm. 33cm
b) their difference between us 28 cm. 9cm
) How many plants can be planted in a circular garden of circumference 26.40 km if a space of 600 cm² is to be allowed for each plant ? 924
) A circle of circumference 88cm is cut out of a square sheet of paper of side 30 cm. What is the area of the paper left ? 284cm²
) If ABCD is a rectangle,
) Two semi-circle of equal radii are cut out of a semi-circular piece of cardboard.
) A rectangle encloses four circles. The radius of each circle is 7cm.
a) rectangle. 784 cm²
b) the shaded portion. 168 cm²
) Find area of the shaded portion formed by a semi-circle placed above the square.
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