A firefighter places a 29 feet ladder, so that the base of the ladder is 21 feet from the wall. What is the height at which the
top of the ladder touches the wall?
1 answer:
Pythagorean theorem:
a^2+b^2=c^2 (C^2 always is the hypotenuse)
21^2+b^2=29^2
441+b^2=841
841-441=400
square root of 400 is 20
Your answer is 20
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