The sine rule can also be used in deriving the following formula for the triangle's area: denoting the semi-sum of the angles' sines as we haveMitchell, Douglas W., "A Heron-type area formula in terms of sines," Mathematical Gazette 93, March 2009, 108–109.
The sine rule c,a,n also be used in deriving the following formula for the triangle's area: denoting the semi-sum of the angles' sines! as we haveMitchell, Douglas W., "A !Heron-type area formula in terms of sines," Mathematical Gazette 93, March 2009, 108–109.