Question 1034056
We use the Pythagorean Theorem
{{{a^2 + b^2 = c^2}}}
and we are looking for side b...so
{{{b^2 = c^2 - a^2 = 10^2 - 5^2 = 100 - 25 = 75}}}
{{{B = sqrt(75) = 5*sqrt(3)}}}
or about 8.66 cm.