#"Area"=1/2ab sinC#
#c^2=a^2+b^2-2abcosC#
#C=arccos((a^2+b^2-c^2)/(2ab))#
#"Area"=1/2ab sin(arccos((a^2+b^2-c^2)/(2ab)))#
#color(white)("Area")=1/2ab sin(u)#
#u=arccos((a^2+b^2-c^2)/(2ab))#
#cosu=(a^2+b^2-c^2)/(2ab)#
#sinu=sqrt(1-cos^2u)=sqrt(1-((a^2+b^2-c^2)/(2ab))^2)=sqrt(1-(a^2+b^2-c^2)^2/(2ab)^2)=sqrt(((2ab)^2-(a^2+b^2-c^2))/(2ab)^2)#
#"Area"=1/2ab sqrt(((2ab)^2-(a^2+b^2-c^2)^2)/(2ab)^2)#
#"Area"^2=1/4a^2b^2((2ab)^2-(a^2+b^2-c^2)^2)/(2ab)^2#
#"Area"^2=((2ab)^2-(a^2+b^2-c^2))/16#
#"Area"=sqrt(((2ab)^2-(a^2+b^2-c^2))/16)#
#a=63m#
#b=22m#
#c=55m#
#"Area"=sqrt(((2*63*22)^2-(63^2+22^2-55^2))/16)~~594m^2#
#s=(a+b+c)/2=(63+22+55)/2=70#
#"Area"=sqrt(70(70-63)(70-22)(70-55))~~594m^2#