SURFACE AREAS AND VOLUMES : SURFACE AREAS AND VOLUMES CHAPTER - 13
EXERCISE - 13.4
QUESTION 4:- A container, opened from the top and made up of a metal sheet, is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 8 cm and 20 cm, respectively. Find the cost of the milk which can completely fill the container, at the rate of Rs 20 per liter. Also find the cost of metal sheet used to make the container, if it costs Rs 8 per 100 cm2. (Take =3.14) : QUESTION 4:- A container, opened from the top and made up of a metal sheet, is in the form of a frustum of a cone of height 16 cm with radii of its lower and upper ends as 8 cm and 20 cm, respectively. Find the cost of the milk which can completely fill the container, at the rate of Rs 20 per liter. Also find the cost of metal sheet used to make the container, if it costs Rs 8 per 100 cm2. (Take =3.14)
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QUESTION 5:- A metallic right circular cone 20 cm high and whose vertical angle is 60˚ is cut into two parts at the middle of its height by a plane parallel to its base. If the frustum so obtained be drawn into a wire of diameter 1/16 cm, find the length of the wire. : QUESTION 5:- A metallic right circular cone 20 cm high and whose vertical angle is 60˚ is cut into two parts at the middle of its height by a plane parallel to its base. If the frustum so obtained be drawn into a wire of diameter 1/16 cm, find the length of the wire.
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