Solve the Problem $\mathrm { ABC }$ With $\mathrm { A } = ( - 2,7 ) , \mathrm { B } = ( 7 , - 1 ) , \mathrm { C } = ( 3,9 )$

Multiple Choice

Solve the problem.
-Find the area of the right triangle $\mathrm { ABC }$ with $\mathrm { A } = ( - 2,7 ) , \mathrm { B } = ( 7 , - 1 ) , \mathrm { C } = ( 3,9 )$ .

A) $\frac { \sqrt { 29 } } { 2 }$ square units
B) 29 square units
C) 58 square units
D) $\frac { \sqrt { 58 } } { 2 }$ square units