Calculate: 1) The angle of the ladder to the ground. 2) The angle of the ladder to the wall. 3) The length of ladder required to reach a height of 6 metres. 4) How much longer the ladder needs to be than the wall, as a %.

1) 76.0 degrees 2) 14.0 degrees 3) 6.2 metres 4) 3.1% Calculate: 1) The angle of the ladder to the ground. 2) The angle of the ladder to the wall. 3) The length of ladder required to reach a height of 6 metres. 4) How much longer the ladder needs to be than the wall, as a %. 1) 76.0 degrees 2) 14.0 degrees 3) 6.2 metres 4) 3.1%

1) 75.5 degrees 2) 11.6 metres 3) 0.5 degrees Some safety manuals state the 4 to 1 rule as the ratio of the ladder length to the distance from the wall. For the ladder shown, calculate: 1) The angle of the ladder to the ground. 2) The height reached by this ladder. 3) The difference between the angle using this 4-1 rule and the angle using the previous 4-1 rule. Why is this so small? 1) 75.5 degrees 2) 11.6 metres 3) 0.5 degrees

√2 : 1 gives 54.7º and 45º (difference of 9.7º) 1 If the ladder rule were 3 to 2, would the difference between the angles be more significant for the two different interpretations of the rules? What would the difference be? 2 Ext: What ratio of sides would give the largest discrepancy? 1. 56.3 and 48.2º (difference of 8.1º) √2 : 1 gives 54.7º and 45º (difference of 9.7º)