phthagorean theorme is a^2+b^2=c^2 where you have a right triangle and c =hypotonuse( normally the longest side, and opposite of right angle) a and b are the legs
so we are given one leg=8 hypotonues=10 subsitute leg=a or b so just subsitute for one subsitutt for b a^2+8^2=10^2 expand 8^2=64 10^2=100 a^2+64=100 subtract 64 from both sides a^2=36 square root both sides a=6 answe ris 6 feet
