Question 311726
The slide is 29 feet long. The ladder leading to the top of the slide is 21 feet long. How far is it from the end of the slide to the foot of the ladder. 
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If the ladder is vertical, making it a right triangle, then:
{{{b^2 = c^2 - a^2}}}
{{{b^2 = 29^2 - 21^2 = 400}}}
b = 20 feet