5. John is trying to determine the length of the staircase he will need for a deck that is 12 feet high. He wants to start the stairs 21 feet from the deck.
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Answer:
Right triangle
legs are 21 and 12
a^2+b^2=c^2
12^2+21^2=c^2
144+441=c^2
585=c^2
sqrt both sides
5√65=c
approx
24.1868=c
about 24.2 feet
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