Question: 1 1 . A ladder is placed against a vertical wall. To be safe, it must be inclined at between ( 7 0 ^

11. A ladder is placed against a vertical wall. To be safe, it must be inclined at between \(70^{\circ}\) and \(80^{\circ}\) to the ground. (a) Is the ladder safe? (b) Calculate the length of the ladder.
1 1 . A ladder is placed against a vertical wall.

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