Question

ajutatima,multumesc,clic pe poza

Answer 1

20) C1=6 cm
      C2=8 cm
....................
A=?
...................
A=$\frac{C1*C2}{2}$=$\frac{6*8}{2}$=$\frac{48}{2}$=24
A= 24 cm²

22) l=4 cm
A=$\frac{l^{2} \sqrt{3} }{4}$=$\frac{4^{2} \sqrt{3} }{4} = \frac{16 \sqrt{3} }{4}= 4 \sqrt{3}$
A=4√3 cm ²

23)A=25√3 cm²
l=?
...............
$\frac{ l^{2} \sqrt{3} }{4}=25 \sqrt{3}$


$l^{2} \sqrt{3}=4*25 \sqrt{3}=> l^{2} \sqrt{3}=100 \sqrt{3} |: \sqrt{3}=> l^{2}=100=>l= \sqrt{100}$=> l=10 cm