A=[tex] \frac{c1*c2}{2} [/tex]
A=[tex] \frac{2,7*2,7}{2} [/tex] = [tex] \frac{7,29}{2} [/tex]=3,64
B) [tex] \frac{3,5*3,5}{2} = \frac{12,25}{2} = 6,12
C) [tex] \frac{(2+ \sqrt{3 x} ) {2} }{2} = \frac{4+4 \sqrt{3}|+3}{2} = \frac{7+4 \sqrt{3} }{2} [/tex]