Question

Dau coroană pls!!!! ​

Answer 1

Răspuns:

Explicație pas cu pas:

a)At=Al+2Ab

72$\sqrt{3}$=54$\sqrt{3}$+2Ab

72$\sqrt{3}$-54$\sqrt{3}$=2Ab

18$\sqrt{3}$=2Ab

Ab=18$\sqrt{3}$ /2

Ab=9$\sqrt{3}$ $cm^{2}$

b) Ab=$\frac{l^{2}\sqrt{3} }{4}$

9$\sqrt{3}$=$\frac{l^{2}\sqrt{3} }{4}$

$l^{2}$$\sqrt{3}$=9$\sqrt{3}$*4

$l^{2}$$\sqrt{3}$=36$\sqrt{3}$

$l^{2}$=$\frac{36\sqrt{3} }{\sqrt{3} }$

$l^{2}$=36

l=$\sqrt{36\\}$=6 cm

c) h=$\frac{l\sqrt{3} }{2}$

h=$\frac{6\sqrt{3} }{2}$

h=3$\sqrt{3}$ cm

d)V=Ab*h

V=9$\sqrt{3\\}$*3$\sqrt{3}$

V=27*3=81 $cm^{3}$

e)m(∠(ABC);(ABC'))=m(∠CMC')=45°

(ABC)∩(ABC')=AB