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11., , 12, , 13., , A 1.5 m tall boy is standing at some distance from a 30 m tall building. The angle, of elevation from his eyes to the top of the building increases from 30° to 60° as, he walks towards the building. Find the distance he walked towards the building., , Section C, Q11 - Q14 are of 4 mark each., , A solid iron pole consists of a cylinder of height 220 cm and base diameter 24 cm,, which is surmounted by another cylinder of height 60 cm and radius 8 cm. Find, the mass of the pole, given that 1 cm? of iron has approximately 8g mass. (Use, nm = 3.14), , .In the given figure XY and X’Y’ are two parallel tangents to a circle with centre O, , and another tangent AB with point of contact C intersecting XY and A and X’Y’ at, B. Prove that ZAOB=90°., , x P AY, , , , OR, , Prove that the angle between the two tangents drawn from an external point to, a circle is supplementary to the angle subtended by the line-segment joining the, points of contact at the centre., , Sanjana took her students of class X to an educational trip where they saw Red, Fort. She told them about the history of Red Fort where she narrated that Red, Fort or Lal Qila is a historic fort located in Old Delhi, India that served as the main, residence of the Mughal Emperors. Emperor Shah Jahan commissioned, construction of the Red Fort on 12 May 1638, when he decided to shift his capital, from Agra to Delhi. She also included that the Red Fort is about 18-33 m (59 108 ft) high.