What is the formula for the area of a non right-angled triangle?
1 Answer
Jun 17, 2018
For a triangle with sides
#A = sqrt(s(s-a)(s-b)(s-c))# where#s = 1/2(a+b+c)#
Explanation:
Assuming you know the lengths
#A = sqrt(s(s-a)(s-b)(s-c))#
where
Alternatively, if you know the three vertices
#A = 1/2 abs(x_1y_2+x_2y_3+x_3y_1-x_1y_3-x_2y_1-x_3y_2)#