- The area of the curved surface of a right circular cylinder is 4400 sq. cn. If its
height is 30 cm., find the area of its whole surface. - The inner and outer diameter of a iron pipe is 12 cm. and 14 cm. respectively. If
the height of the pipe is 5 m., find the weight of the iron pipe where weight of 7.2
gm. iron = 1 cm^3. - The length and the breadth of a rectangular region are 12 m. and 5m.
respectively. There is a circular region just around the rectangle. The places
which is are not occupied by the rectangle, are planted with grass.
(a) Describe the information above with a figure.
(b) Find the diameter of the circular region.
(c) If the cost of planting grass per sq. m. is Tk. 50, find the total cost.
19.'ABC and 'BCD are on the same base BC and on the same parallel lines BC
andAD.
(a) Draw a figure as per the description above.
(b) Proof that ' region ABC =' region BCD.
(c) Draw a parallelogram whose area is equal to the area of 'ABC and whose
one of the angles is equal to a given angle (construction and description of
construction is must).
20.ABCD is a parallelogram and BCEF is a rectangle and BC is the base of both
of them.
(a) Draw a figure of the rectangle and the parallelogram assuming the same
height.
(b) Show that the perimeter of ABCD is greater than the perimeter of BCEF.
(c) Ratio of length and width of the rectangle is 5 : 3 and its perimeter is 48
m. Determine the area of the parallelogram
barré
(Barré)
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