An open metal bucket is in the shape of a cone of height 21 cm with radii of its lower and upper endsas 10 cm and 20 CM respectively. find the cost of milk which are completely filled the bucket at rupees 30 per litre
ABC is a triangle is D is a point on a b such that ad is equals to one by fourth of a b and D is a point on AC such that a is equals to one by fourth AC if d is equal to 12 cm find BC