Very important question of mensuration including
very important concept of it.need solution!
Rd sharma class 10 maths exercise-16.3 mensuration.
we have to find the vploume of the bucket and the
cost of tin sheet used for making the bucket at
the rate of rsn1.20 per dm2 given that a bucket
has top and bottom diameters of 40 cm and 20 cm
respectively.Depth is given 12cm.
Given,
Diameter to top of bucket = 40 cm
So, the radius (r1) = 40/2 = 20 cm
Diameter of bottom part of the bucket = 20 cm
So, the radius (r2) = 30/2 = 10cm
Depth of the bucket (h) = 12 cm
Volume of the bucket = 1/3 π(r22 + r12 + r1 r2 )h
= π/3(202 + 102 + 20 × 10)12
= 8800 cm3
Now,
Given that the cost of tin sheet used for making bucket per dm2 = Rs 1.20
So, the total cost for 17.87dm2 = 1.20 × 17.87 = Rs 21.40
Therefore, the cost of tin sheet used for making the bucket is Rs 21.40