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7. Find the distance from the eye at which a coin of 2.2 em diameler should be held 50 as to conceal the full moor. with angular diameler \( 30 ^ { 2 } \) 8. The wheel of a raimay carriage is \( 40 \mathrm { cm } \) in diameter and makes 7 revolutions in a second, find the speed of vain

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