BAE=ABE
S=BE*BC=12BE;
cos30=AE/BE
AE=cos30*BE
AE=(3^0.5/2)*4=4*3^0.5
S=(4*3^0.5)*12=48*3^0.5
^0.5 - КОРЕНЬ
BAE=ABE
S=BE*BC=12BE;
cos30=AE/BE
AE=cos30*BE
AE=(3^0.5/2)*4=4*3^0.5
S=(4*3^0.5)*12=48*3^0.5
^0.5 - КОРЕНЬ