Question

Aflați aria triunghiuluiABC determinat de punctele A(1,2),B(-1,1),C(3,5)

Answer 1

Răspuns:

$ab = \sqrt{( - 1 - 1) ^{2} + (1 - 2) ^{2} } = \sqrt{5}$

$bc = \sqrt{(3 + 1)^{2} + (5 - 1)^{2} } = 4 \sqrt{2}$

$ac = \sqrt{(3 - 1)^{2} + (5 - 2) ^{2} } = \sqrt{13}$