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If the angle of elevation of the Sun changes from $30^{0}$ to $45^{0}$ ,the length of the shadow of a pillar decreases by 20 metres. The height of the pillar is1). $20(\sqrt{3} - 1)$m2). $20(\sqrt{3} + 1)$ m3). $10(\sqrt{3} - 1)$ m4). $10(\sqrt{3} + 1)$ m |
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