Question

What is the area of triangle ABC? The points are on a grid.A(-7,31),B(12,0),C(16,0).

Answer 1

Figure not drawn to scale.
Can you be able to find the length of each side using that diagram I have plotted?

Answer 2

well bc = 4 not sure how you get ab and ac

Answer 3

you can use this formula
\[1/2\left| x1(y2-y3)+x2(y3-y1)+x3(y1-y2) \right|\]

Answer 4

x1=-7
y1=31
x2=12
y2=0
x3=16
y3=0

Answer 5

Simply:

|BC|=4
height h = 31 (y of A)

T = 1/2 * |BC| * h = 0.5*4*31 = 62

Checked with:

http://www.triangle-calculator.com/?what=vc&a=-7&a1=31&3dd=3D&a2=&b=12&b1=0&b2=&c=16&c1=0&c2=&submit=Solve&3d=0