Triangle abc has vertices at a(-2,1), b(-2,-3), and c(1,-2). what is the area of the triangle? a 18 square units b 9 square units c 6 square units d 12 square units

Option C. 6 square units

Step-by-step explanation:

we know that

Heron's Formula is a method for calculating the area of a triangle when you know the lengths of all three sides.  

Let  

a,b,c be the lengths of the sides of a triangle.  

The area is given by:

where

p is half the perimeter

p=

we have

Triangle ABC has vertices at A(-2,1), B(-2,-3), and C(1,-2)

the formula to calculate the distance between two points is equal to

step 1

Find the distance AB

step 2

Find the distance BC

step 3

Find the distance AC

step 4

Find the half perimeter p

p=

Find the area

answer:   b

step-by-step explanation:

x2 = 16

x can not be a negative number because 16 is positive

the only answer would be positive 8  

if you was gonna solve for a, a is a   < -12