algebra 1
posted by tyyyyyy .
if you have a 10ft ladder placd leaning against the wall,and the ladder is 6ft from the wall.how high does the ladder reach on the wall?

\
 \
x  \ 10
_ _\
6
Pythagorean theorem:
a^2 + b^2 = c^2
here you are looking for a so..
a^2 + 6^2 = 10^2
a^2 + 36 = 100
100  36 = 64
square root of 64 is 8
a= 8ft
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