It should be placed 2 ft from the wall
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The angle formed between the ladder and the house is typically a right angle (90 degrees) if the ladder is resting against the wall of the house. This assumes that the base of the ladder is on the ground and the wall is vertical. If the ladder is leaning at an angle, the specific angle would depend on how far the base of the ladder is from the wall and its height against the wall.
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Using Pythagoras' theorem the the foot of the ladder should be 12 feet away from the base of the building.
It should be placed 2 ft from the wall
1/4 the height of the ladder. (flat top on rungs should be level when ladder is placed right.
The ladder is 7 foot up the wall if the ladder if the ladder is 3 ft away from wall.
3 FEET
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Using Pythagoras' theorem the the foot of the ladder should be 12 feet away from the base of the building.
Use the cosine ratio: 5.437846722 meters
c2=a2+b2102=62+b2100=36 + b2b2=64b=8
1 i think other people feel free to change this
15 meters, or less, depending on the angle.