Question 1085918
{{{ 8^2 = 7^2+14^2-2(7)(14)cosA }}}
Solving for A:
{{{ 64 = 49 + 196 - 196cosA }}}
{{{ -181 = -196cosA }}}
{{{ cosA = 181/196 = 0.923469 }}}
{{{ A = cos^-1(0.923469) = 0.393769 }}} radians (about 22.561 degrees)