google it, this is what i got
How tall does your ladder need to be?
Stepladder
• To reach 7 feet: 3-foot ladder
• To reach 8 feet: 4-foot ladder
• To reach 10 feet: 6-foot ladder
• To reach 11 feet: 7-foot ladder
• To reach 12 feet: 8-foot ladder
• To reach 14 feet: 10-foot ladder
• To reach 16 feet: 12-foot ladder
• To reach 18 feet: 14-foot ladder
• To reach 20 feet: 16-foot ladder
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