Q. 124.6( 5 Votes )

Answer :

Volume of the frustum = = 12308.8

⇒ h = 15cm

Let l be the slant height of the bucket

⇒ Slant height, l =

⇒ l = 17cm

∴ length of the bucket, l = 17cm

Curved surface area = π(r’ + r’’)l + π r’’^{2}

= π(20 + 12)(17) + π (12)^{2}

= 2160.32 cm^{2}

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PREVIOUSA metallic right circular cone 20 cm high and whose vertical angle is 90° is cut into two parts at the middle point of its axis by a plane parallel to the base. If the frustum so obtained be drawn into a wire of diameter (1/16) cm, find the length of the wire.NEXTA bucket made of aluminium sheet is of height 20 cm and its upper and lower ends are of radius 25 cm and 10 cm respectively. Find the cost of making the bucket if the aluminium sheet costs Rs. 70 per 100 .