Question

Sa se determine aria triunghiului echilateral ABC cu A(1,2) si B (2, -2)​

Answer 1

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

Aflam AB

d(A,B)=$\sqrt{(x_B-x_A)^2+(y_B-y_A)^2}$

$d(A,B)=\sqrt{(2-1)^2+(-2-2)^2}=\sqrt{1+16} =\sqrt{17}$

$A=\frac{17\sqrt{3} }{4}$